The suspect has been identified as Brian Dowling, of Brooklyn. He's charged with murder and criminal possession of a weapon.
Dowling has been charged with murder with depraved indifference and criminal possession of a weapon. He was denied bail by a judge.
Carson, 32, was waiting at a bus stop with his girlfriend Monday around 4 a.m. when the NYPD said the suspect came up to him, demanding to know what he was looking at.
Brian Dowling was charged with murder and criminal possession of a weapon Thursday morning.
Authorities said the suspect charged the couple and Carson fell to the ground before being stabbed in the chest three times, with one stab striking his heart, killing him.
Police said the suspect then took off and moments later a woman, believed to be the suspect's girlfriend, showed up and apologized, muttering the name "Brian."
Police said they wanted to question the woman, who is believed to have had an argument with the suspect prior to the deadly stabbing.
The NYPD said the suspect had been acting erratically before the deadly attack, turning over scooters on the street.
Friends and family of Carson have started a GoFundMe campaign, asking for help on behalf of Carson's partner.
Police are asking anyone with information to call 1-800-577-tips.