Dhananjay Kumar Sinha, 54, a former Navy man, hit Kanu Jadhav, 72, a porter, with a piece of wood Monday 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 Tuesday remanded him in police custody till February 16.
Both Sinha and Jadhav were Khadavali residents, the inspector said.
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