( CNN ) -- Police in New York City are looking for a suspect they say pushed a man to his death from the subway platform into the path of the D train on Sunday . Police have little to go on . Lt. John Grimpel says a male suspect was wearing a dark jacket . The act is `` believed to be random , '' he said . Bronx resident Wai Kuen Kwok , 61 , was killed by the incoming subway train , police said . Kwok 's wife was with him and was taken to the hospital for trauma , police said , though she was not physically injured . Kwok was standing on the platform at the subway station at 167th Street and Grand Concourse , when he was apparently pushed . First responders arrived at about 8:45 a.m. , and Kwok was pronounced dead at the scene . The suspect then fled the station but has not been identified or located , police said . The incident is being investigated as a homicide , but a motive was lacking at the outset . Police would not speculate whether there was an altercation between Kwok and the suspect or whether there are any indications of a hate crime . Sunday evening , police released surveillance video of a person wanted for questioning in connection with the homicide but did not call the person a suspect .
A man dies after being pushed onto the subway tracks at a Bronx station , police say . There is a search for the male suspect , but police have few details .