SAN DIEGO — According to newly released documents, Las Vegas shooter Stephen Paddock may have targeted Southern California before the horrific mass shooting at a Las Vegas music festival last October.

As America copes with a mass-shooting in Sin City, the shooter's girlfriend Marilou Danley returns to the US, in a case that has baffled investigators for the lack of an apparent motive.

Even after a 10-month investigation, much will forever remain unknown about the deadliest mass shooting in modern U.S. history, most notably the reason behind it. But the massacre does appear to have ...

In this photo released by Warner Bros., a taping of "The Ellen DeGeneres Show" is seen at the Warner Bros. lot in Burbank, Calif. (Photo by Michael Rozman/Warner Bros.) In this photo released by ...

Late Sunday night, sketchy first reports of the Las Vegas shooting began to appear on social media. Seconds after shaky videos and disturbing photos were tweeted, partisans on all sides began tying ...

A court hearing for the Arizona man accused of selling armor-piercing ammunition to the suspected gunman in last year's Las Vegas mass shooting is set for Monday. The hearing is expected to focus on ...

Las Vegas shooting kills 50 and leaves 200 injured as Mandalay Bay hotel gun maniac Stephen Paddock carries out worst gun massacre in US history Las Vegas shooting kills 50 and leaves 200 injured as ...