An Arizona man who tweeted about killing his roommate was arrested two days later, after allegedly murdering the other man. Police said 21-year-old Zachary Penton called them on Sunday to say he had shot his roommate after an altercation at the home they shared in Gilbert, a Phoenix suburb.

Penton was taken into custody and booked on murder charges at Maricopa County Jail. The victim, 41-year-old Daniel Garofalo, was pronounced dead at the scene. Officers also recovered the handgun thought to have been used in the shooting. With the investigation ongoing, attention has focused on a Twitter account apparently attributed to Mr Penton.

On Friday, the 21-year-old wrote that he might “viciously murder” his roommates unless he moved out of the home. In a separate post, he suggested that at least two of the people he lived with had got into a drunken brawl after one of them was stung by a bee.