Tyrone Worrell, 39, of Dorchester, was ordered held without bail at his arraignment today on charges he fatally shot Tarek Mroue (right) in a road-rage incident on Winthrop Street in Roxbury Wednesday evening, the Suffolk County District Attorney's office reports.

Worrell was arrested not long after the shooting and had originally been scheduled for arraignment on Thursday, but that was put off for a day after he told police he'd managed to swallow "a quantity of heroin" and he was rushed to a hospital for possible treatment, the DA's office reports.

According to the DA's office:

Evidence developed during the past two days suggests that Worrell was involved in a dispute with another motorist on Wednesday evening. That dispute continued on Winthrop Street, where Worrell allegedly slashed the tires of the second vehicle. Worrell then allegedly left the scene and returned a short time later. He allegedly produced a firearm and fired multiple shots into the vehicle, striking and killing Mroue. A witness at the scene gave police a description of the assailant and his vehicle. Minutes later, Boston Police spotted that vehicle about a half-mile away and took him into custody.

According to a friend of the family, Mroue, a father of three young children, was looking for a particular address to which he planned to deliver the washer and dryer in the bed of his pickup:

They tried asking people for directions and were ignored. The suspect was behind them and started beeping. Words were exchanged and the suspect got out of his car and stabbed one of their tires and took off. So, the people in the truck called AAA and waited. The suspect came back, knowing the truck wasn't going anywhere, with a gun and began shooting. He was hit three times, once in jugular. This is a horror show for this family and their three young children.

Innocent, etc.