Vice President Mike Pence visits Las Vegas

Pence visited a memorial honoring the 58 people killed in the mass shooting, as authorities reveal they believe the shooter may have had severe mental illness.
3:09 | 10/08/17

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Transcript for Vice President Mike Pence visits Las Vegas
Marciano in a moment. New clues on senseless night of violence on Las Vegas offering possible insight into a killer's state of mind. They come from a note found in Stephen paddock's hotel room as well as from a man who claims he spoke to paddock just months before the massacre. ABC's Kenneth Moton joins us from Las Vegas where vice president pence is remembering the victimsover night, Kenneth. Reporter: Good morning, Jon and Paula. The vice president made a stop at this growing memorial. Since the shooting we know investigators have interviewed hundreds of people and federal profilers are working to figure out what drove the killer to be calculated and cold-blooded. This morning, disturbing new details about Las Vegas mass killer Stephen paddock. Still no motive for opening fire on that music festival one week ago. But sources reveal to ABC news investigators increasingly believe paddock had severe mental illness likely undiagnosed. They describe paddock as stand offish. Disconnected and anti-social. Traits of past mass shooters. That note found on his nighttan in mandalay bay, CBS "60 minutes" reporting it contained written calculations about where he needed to aim to maximize accuracy and kill as many as possible. Investigators are hoping to learn more from people like Scott Armstrong, the Reno card dealer emotional after he says he came face-to-face with paddock on his lot two months ago. You know, no smiles, not very friendly at all. He said he was terribly depressed and that his life was miserable. I just was thinking to myself, this guy, I got to get away from because he was so down or negative or -- I couldn't help him. Reporter: On Sunday night las Vegas came face-to-face with pure evil. Reporter: Vice president pence visited the memorial honoring the 5 people killed. ??? I won't back down ??? Reporter: Saturday night Jason aldean, the country star on stage during the horrific attack spoke out on "Snl." We're going to walk through these time times together. Reporter: Cody and his big sister were at the festival. Marky, 41 weeks pregnant. I was worried even if I got shot what about the baby. Reporter: Cody covered his sister and got her to safety never revealing he had been shot in the shoulder. I didn't want anybody else to worry about it so I just kind of sucked it up and wanted everybody else to get home. Reporter: Cody was released from the hospital Saturday. Markie gave birth to why yoyatt, 9 pounds 1 ounce, yes, 911 just two days after so many lost their lives. Welcome to the world, baby Wyatt. As so many impacted by this, we now know that the family of one of the victims has taken legal action to freeze the gunman's assets for potential lawsuits. He has several properties and reported $5 million in earnings in 2015. Jon and Paula. Kenneth, thanks for your reporting. Thanks for sharing the story of little baby Wyatt bringing a little bit of sunshine to las Vegas this morning.

This transcript has been automatically generated and may not be 100% accurate.

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