NYPD officers arrested a suspect after he punched a 55-year-old Brooklyn man in the face during a dispute on the downtown C/E subway platform at NYC’s 34th Street-Penn Station on Saturday night.

An argument broke put when the victim accidentally bumped into the suspect, who then struck him and fled. The man stumbled around for about five minutes before collapsing unconscious. He was found unresponsive just before 7 p.m., rushed to Lenox Hill Hospital where he was unfortunately pronounced dead.

A medical examiner is working to determine the cause of death, and the investigation continues with charges pending.