Meanwhile, a funeral is planned for the victim, 32-year-old Mohamed Bilal, who leaves behind a wife and 2-month-old daughter.
Police arrested 24-year-old Robert Bullock Tuesday night. A coworker says he was trying to rob the store in East New York on Monday when he panicked and opened fire on the computer repairman.
According to investigators, Bullock is the man caught on surveillance video riding his bike up to the store. He leaves it propped up against a fence, lingers around a bus stop for a few minutes, goes inside the New Attitude veriety store, exits within 30 seconds and takes off on the bike.
And if Bullock feels any remorse over the murder, he had a funny way of showing it.
"Robert, do you have anything to say?" Eyewitness News reporter Josh Einiger asked.
"[Expletive] my [expletive]," he said.
Bullock denied killing Bilal. His own mother was there to see cops cart him away.
"My son is a good guy," she said. "He's a very good guy...you all got the wrong person."