Guy Kills His Roommate Just Two Days After Threatening Tweet

21-year-old Zachary Penton from Gilbert, Arizona posted a tweet on Friday night that said, "I need to move out of my place before I viciously murder my roommates."

It turns out he wasn't just venting and exaggerating, he was being literal. Zachary got into an argument with his 41-year-old roommate Daniel Garofalo on Sunday after Daniel tried to get him to move out and Zachary shot and killed him.

He was arrested and charged with second-degree murder. Now when you look at his Twitter history, it's nothing but red flags. Two months ago, he tweeted: