Tonight, what officials just said about the mysterious death of Gene Hackman and his wife,

the devastating news conference laying out the timeline. What officials say killed Hackman's wife,

Betsy Arakawa. It's called hauntavirus, incredibly rare and spread by rodents.

Officials also saying the Academy Award-winning actor died of heart disease and

Alzheimer's one week later, the questions we asked the medical examiner. Also breaking tonight,

the death row inmate set to die by firing squad in South Carolina, the first in years.

The extreme weather slamming parts of the East Coast, the multi-story scaffolding,

collapsing in Boston. The new reporting, Elon Musk, clashing with Secretary of State

Marco Rubio and Transportation Secretary Sean Duffy over layoffs, what the president said tonight

about the showdown. Explosions in the sky, a second SpaceX launch

explodes moments after liftoff, chunks of the capsule raining down on the Caribbean.

On the front lines are Kier Simmons, the first American network correspondent in a part of Russia

where Ukrainians are on the attack. Plus, Trump's new warning to Putin.

You did not kill a soul?

Absolutely not.

You didn't do any of those things you've been convicted of doing?

Correct.

Convicted killer Laurie Valo-Daybell speaks out in her first TV interview to Dateline's Keith Morrison, what she told him about her blockbuster case.

This is NBC Nightly News with Lester Holt.

And good evening. I'm Tom Yamous in for Lester. Tonight as we come on the air, the medical

examiner in New Mexico, sharing stunning new details in the death of Gene Hackman

and his wife. Betsy Arakawa now thought to have died from a very rare infection spread

...