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Tonight, the dangerous flooding in Alaska. This house swept away. Is climate change to blame? Dream vacation turned deadly. The American publishing executive killed off the Amalfi Coast when her beau crashed into another. Why the captain may be charged with manslaughter. Caught on video. This man rescued as his boat was sinking off Florida. And the emotional reunion with his parents.

I gave up hope. I should never give up hope. Don't give up on the big guy.

And a major supermarket chain experimenting by going all self-checkout. Will other stores follow and will customers buy it? No.

Those machines do not work.

This is NBC Nightly News with Kate Snow.

Good evening. I'm Peter Alexander in for a great American comeback, celebrating the most decorated women's gymnast in history, Simone Biles, returning to competition for the first time in two years after an extended break to focus on her mental health. And Biles looked like she never left. Dana Griffin has more. Oh, great. James.

And just like that. So Biles, amidst her remarkable return to competition after a two year hiatus. It sounds like from our coaches, it's been the best thing that could have happened to her. It just made my heart melt that they still believe in me. Biles took a sobering step back from competing to focus on her mental health after this 2021 Tokyo Olympics misstep.

Very uncharacteristic vault for Simone. The four time Olympic gold medalist had experienced the twisties, a dangerous mental block called gymnasts to lose spatial awareness, forcing Biles to withdraw from the team. Final. But after this phenomenal performance in the finals, Biles won the all around title with a five point lead over last year's winner.

Wow. I worked a lot on myself and I believe in myself a little bit more.

While sidelined, the world's most decorated gymnast worked on her mental health, got married and was awarded the Presidential Medal of Freedom. Simone Biles Taking time off, what did that do for her career?

I think a lot of people questioned it.

Honestly, not that many people, especially in the sport of gymnastics, can take that long of a break and come back and compete at a high level. The big question now, is Simone ready for Paris 2024?

My main goal was this. And then championships and then after that will jump onto worlds and then we'll see back. So far, it's heading in the right direction. Absolutely incredible.

Proving all around Simone Biles is still the best. Dana Griffin, NBC News.

Record flooding surge through the capital city of Juneau after part of a glacier broke along a lake. Here's a look at it. You can see the moment that this house collapsed into the rushing water. The Mendenhall River rose to a record level nearly 15 feet with several other homes falling in as well. The flooding for city officials there to issue evacuation orders from some for some residents.

Now to politics where the clock is ticking for former President Trump's legal team. His lawyers have until tomorrow to respond to a request from the Justice Department's special counsel that just days after the former president's third indictment could force him to stay silent about evidence in the case. Ali Raffa has the very latest.

This guy is a maniac. They gave me a maniac.

Former President Trump Saturday night going after special counsel Jack Smith and today attacking the judge overseeing his 2020 election interference case. Posting to a social media platform in part, quote, There is no way I can get a fair trial with the judge all as a new deadline from that same judge looms. Mr. Trump's legal team needs to respond by 5 p.m. Monday to a request from the special counsel that would block him from commenting publicly on parts of the case.

Prosecutors warning he could use evidence in a way that may have a chilling effect on witnesses, citing this post where he warns, quote, If you go after me, I'm coming after you. The former president's defense attorney, John Lauro, firing back across the airwaves.

We're going to oppose it as we have.

And denying the indictments claims that his client ordered Vice President Mike Pence to overturn the 2020 election results on January 6th.

What President Trump did not do is direct Vice President Pence to do anything. He asked him in an aspirational way. Asking is covered by the first Amendment.

Pence, a key witness in the grand jury case that led to the indictment of his former boss not ruling out testifying in this case, if compelled.

I have no plans to testify, but look. Well, we'll always we'll always comply with the law.

And Ali joins us now. Ali, we have that deadline tomorrow whether former President Trump can be prohibited from speaking out about details in this case. How is it likely to play out?

Yeah, well, legal experts say weighing the case is security. And Mr. Trump's First Amendment rights is a difficult decision for the judge. But even tougher will be how do we even enforce this, Peter?

Ali Raffa with the very latest. Ali, thank you. A quick programing note, by the way, don't miss our NBC News exclusive interview tomorrow with Florida Governor Ron DeSantis and his wife, Casey. Again, that's tomorrow on today and on Nightly News. Overseas, a boat crash off of Italy's famed Amalfi Coast is now being investigated as a possible manslaughter case after a top American publishing executive was killed.

Priscilla Thompson has those details.

A tragic ending to a family vacation in paradise. Party goers capturing the moment a speedboat slammed into their sailboat off Italy's Amalfi Coast on Thursday.

Jesus Christ.

Italian officials say 45 year old Adrian Vaughan was thrown from the motor boat. She had rented with her husband and two children. People nearby scrambled frantically to get her out of the water. A crew member aboard the sailboat describing the chaotic moments.

Now.

Saying the captain immediately ordered everyone in the water to be rescued. Some on board diving in to help save Vaughan. Witnesses were able to get her ashore, but authorities say Vaughan died before she could be flown to the hospital. Authorities say Vaughan's children were not physically hurt in the collision, but that her husband and the speed boats captain were injured and taken to nearby hospitals.

Beside the point on a collision.

Now, local prosecutors say they're investigating the 30 year old captain of the speedboat. Four suspected manslaughter and involuntary shipwreck.

Loss keeper Riddle.

Officials say the captain was tested for alcohol and other substances. The results of which are still being evaluated as tonight Vonn is being remembered. She was the president of Bloomsbury, USA. The company issuing a statement highlighting her great personal warmth and fierce determination as they, along with Vonn's family, grapple with their tremendous loss. Priscilla Thompson, NBC News.

And still ahead here tonight, new details about the dramatic rescue of a man whose small boat drifted 12 miles away from shore. How do you survive? We are back now with new details about that dramatic Coast Guard rescue after a man's small boat was submerged in water 12 miles off the Florida coast. Marissa Pera has that story.

In the moments after a miraculous rescue. Gratitude hits this mother like a wave. We cannot thank the Coast Guard fire rescue. So, you know, gets to everybody. We just want to say thank you so much. This was her son, Charles Gregory, just hours before the 25 year old seen hugging his knees alone in lost at sea for almost two days after fishing trip gone wrong.

He lost his engine when he got swept out to sea at some point. His vessel capsize. He lost all his survival equipment, including his phone, which he would have been able to use to call out to us.

The clock was ticking. He had no food, no water. And his boat was on the brink of sinking. Forced to tread the Florida Ocean for as long as his body and the sharks would let him.

That any kind of marine life would be a concern.

Rescuers, desperate for a sign of life, finally spotted a sight for sore eyes early Saturday morning. There was the 25 year old waving at them from a boat half full.

We didn't want his legs to give out underneath him based on the fact that he had been out there for such a great period of time.

Loaded onto a gurney on land with cracked lips and skin from the sun, Charles gives his frantic parents a weak sign. He's okay.

There is a guard up there. If you ever thought it wouldn't let your kid go missing offshore in the friggin ocean for 38 hours, I gave up hope. I should never give up hope. Don't give up on the big guy.

Marissa Parra, NBC News.

What an unbelievable rescue. There we are. Back in a moment with a major supermarket chain now experimenting with going self-checkout only. But are customers on board self-checkout stations at supermarkets? You either love them or you hate them. And let's be honest, a lot of people hate them. But now one major supermarket chain is experimenting with an all self-checkout system.

That means no human cashiers will others follow? George Solis has a closer look.

Place your item in the bag here they are.

Supermarket contraptions.

Help is on the way.

Causing super headaches.

Is your in the bag here?

The self-checkout lane.

I hate self-checkout. Those machines do not work.

Last resort. Last resort for me.

Despite the hate. Stores are ringing up even more of them. I always have to call.

Somebody to come over anyway. It makes for a difficult time.

Kroger, one of the nation's largest supermarket chains, has just converted one of its stores to self-checkout only. Wal-Mart and Dollar General also experimenting with no man registers. If your store went for self-checkout out. How big of a problem would that be for you? Huge. But are we now at a point where it is here to stay forever?

Oh, yeah.

I don't see we're turning back on this stool.

Leonard Jr. Owns seven stores in the New York area and says he's noticed an obvious trend.

The younger people embrace it and love to use it more than older people. I don't see much gray hair. Self-Checkout line.

He says 75% of his customers still prefer human cashiers. So he's keeping them. But there are labor savings with self-checkout.

We have one cashier for one customer at regular checkout, but over here we try to have eight of them. I think, and we have two people on board right now. The ratio now goes 4 to 1.

There's some growing pains associated with it.

Just like any technology, you know, self-checkout through our growing things.

Here's where things can really go off the rails. This kind of beans, no problem. One is organic bananas. Well, that's a whole nother story.

Health is required for this item.

Help is on the way. Leonard believes the technology will get better. Customers will get more used to it. Others, however, aren't as optimistic.

I don't think that there's one shopper in the nation who would like to go to an all self-checkout store. And frankly, as these retailers are putting in more stores that are only.

Self-Checkout, I think their sales are going to decline.

By one estimate. 95% of stores now have some form of self-checkout, so it's unlikely any of them will bag the concept soon. George Solis, NBC News, New York.

Always have trouble looking up the number for broccoli, right? When we come back, there is good news tonight about the long road to this fist bump and the teacher who took an unbelievable step to help his students.

There is good news tonight about a teacher who raised his hand to help a student and in the process change the boy's life. Jesse Kersh has this story.

For years, Roman McCormick struggled.

I've constantly was tired. I had a low energy.

The 15 year old was born with the condition known as Bones Syndrome, impacting his kidneys. I look forward to seeing him and playing soccer every weekend. And now I'm saying I'm sorry, too. I'm just too tired, you know, just. It just really broke my heart. It was clear Roman needed a new kidney, but after months of waiting, his family couldn't find a donor.

So they went public. Roman's parents pleading for help.

Do anything for your kids.

They were feeling desperate until late June, when they got a surprise phone call.

Not only is there a donor, it's me.

His geometry teacher, Eddie McCarthy. Romans ninth grade math teacher heard the family's pleas.

You know, I think the guilt would have just been so much if I was just like.

Hey, Roman, praying for you. So without telling Roman or his parents, Eddie went through extensive testing. I wouldn't want to get their hopes up and learned he was a match. What did it mean to you to realize that your teacher was going to do this for you?

I was wondering, did I get that good of grades to deserve this?

Just last month, both Roman and Eddie had their surgeries. So excited. And nearly two weeks later, we were there as the duo reunited.

To see a man by the.

Sea after all. Now, Roman's excited to play soccer again.

Can't wait to start doing what I wanted to do since I was 13.

That's a huge part of my life, being active and having fun. It's awesome to be able to give them that gift.

Thank you, guys. A priceless gift Roman's grateful family won't soon forget.

This means the world to me.

So we love you.

Yeah, you. I love you guys. Me forever connected.

Connected by a teacher. Student bond unlike any other.

My teacher saved my life.

Jesse Kersh, NBC News, Toledo, Ohio.

That is nightly news for this Sunday on Peter Alexander. Have a good night.

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