A man was shot and killed in Dorchester Monday afternoon and police are now looking for a suspect.

The shooting happened on Bullard Street just before 3 p.m. The victim, a 20-year-old man, was taken to the hospital where he was pronounced dead.

Kasey Williams, who knows the victim, said the man was at the house visiting his girlfriend. Williams said he believes the couple had an argument and when the man left, someone may have been waiting outside for him.

Boston Police are asking for anyone with information on the shooting to contact them.

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