One year ago on Sunday, Thomas Crooks tried to assassinate President Trump at a campaign rally in Butler, Pennsylvania. A CBS News investigation shows what is known about Crooks.

Thomas Crook's cell phone was pictured alongside a remote transmitter and his dead body atop the manufacturing plant where he shot former President Donald Trump — as it was revealed he asked his ...

FBI officials say 25 to 30 seconds later, Crooks fired eight rounds at Trump. He was then shot and killed by the Secret Service counter-sniper. Contributing: Bryce Buyakie, Akron Beacon Journal.