Dhananjay Kumar Sinha (54), a former Navy man, hit Kanu Jadhav (72), a porter, with a piece of wood yesterday afternoon following a quarrel, police said.
Onlookers held Sinha and handed him over to police, said inspector Pradeep Kasbe of Kalyan taluka police station.
Sinha was booked for murder. A local court today remanded him in police custody till February 16.
Both Sinha and Jadhav were Khadavali residents, the inspector said.