The incident occurred on Friday morning, they said.
The victim, identified as Virendra Yadav, used to sell idlis. On Friday, three customers came to his road-side joint and told him that he owed them Rs 20. Soon, an argument broke out and escalated into a scuffle, a police official said.
“The trio pushed the vendor, due to which he fell down and suffered head injuries. Other people rushed him to a nearby hospital, where he was declared brought dead,” he said.
His body was later sent for post-mortem, the official said.
A case of murder was registered against the three accused at Naya Nagar police station in Mira Road.
The Mira Bhayandar-Vasai Virar police have launched a search to trace the accused.