A 26-year-old man had an argument with a co-worker before allegedly fatally shooting the colleague in Washington Heights, prosecutors said Friday.

Bobby Martin, who was charged with first-degree murder Thursday, made his first appearance Friday in Cook County court.

Martin, is accused of killing his co-worker, Antoine Alexander, 32, in a parking lot at 9411 S Ashland Ave about 3:30 p.m. on Tuesday, according to Chicago police.

Prosecutors said Martin and Alexander worked together at an armed security company and got into a verbal altercation inside the guard shack on Tuesday afternoon. During the altercation, prosecutors said Alexander removed his bullet proof vest and threw it to the ground. A witness, another co-worker, then told the defendant and the victim to take the altercation outside.

After stepping outside, the defendant pulled his firearm and fired one shot into the victims abdomen, prosecutors said. The victim’s firearm was holstered at the time of the argument and the shooting. The defendant fled the scene and came into contact with another co-worker, whom he told that he had just shot Alexander.

Alexander was then taken to Advocate Christ Medical Center in Oak Lawn, where he was pronounced dead.

Martin was arrested by authorities three blocks from his home approximately 20 minutes after the shooting, prosecutors said.

Martin was detained and will appear in court again on March 17, authorities said.

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