A man is on life support after apparently falling or jumping from the back of a truck

ROCHESTER — Troopers say an investigation has determined that the man found seriously hurt on I-490 early Sunday morning likely fell or jumped off a truck.

At a news conference on Wednesday, troopers said surveillance video helped them to piece together what happened in the strange incident.

Investigators say Tabarri Goins, age 24, left his home around 2:30 a.m. on foot. Troopers say they have video showing him walking through downtown Rochester alone before moving toward Frontier Field.

Troopers say Goins cut through a parking lot off Morrie Silver Way to Brown Street. At Brown Street, troopers say Goins climbed onto the back of a tractor trailer milk truck at a stop light.

"As the truck leaves the intersection, we can see white sneakers behind the truck, as the person is attempting to climb on the back," explained Captain Carolyn Mullin, of the New York State Police Bureau of Criminal Investigation.

The truck then turned onto the I-490 ramp heading west. Minutes later, around 3 a.m., troopers say they received a 911 call for a man lying in the road with a head injury.

"During our investigation, it is our belief that his injuries were caused by either falling off this milk truck or jumping," Mullin concluded. "We do not believe his injuries were caused by any criminal act at this time."

The captain added, "He was attempting to get on the other side of the 490 to his girlfriend's house. But he wouldn't have taken 490. It is our belief, when he realized the truck was going on the on-ramp, that's why he might have jumped off."

Troopers say Goins is currently on life support at Strong Memorial Hospital. Investigators say the milk truck driver was unaware that the man was on the back of the truck.