According to police, the driver was allegedly harassing the fiancee of the victim, identified as Nilesh Patel.
The woman, who works at a hospital in suburban Malad, brought the matter to the notice of Patel, he said.
Patel approached the driver last night and told him to stay from the woman, the officer said, adding that the driver asked Patel to break off his engagement with the woman as he was in love with her.
The driver and his friends tried to overpower Patel and his friends, but they fled on a bike.
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However, the accused started chasing Patel's bike, the officer said.
When Patel was taking a turn near Charkop village, he crashed into a tempo and died while his friend, who was riding pillion, sustained injuries, he said.
Meanwhile, Patel's another friend approached the police today and recorded his statement, following which the driver and his friends were arrested, the officer added.
They have been booked for culpable homicide not amounting to murder, the official said.
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