Investigators believe Fonseca-Rivera was shot inside the truck between 1 p.m. and 1:30 p.m. , near the spot where he was found, State Police said.

Roberto Fonseca-Rivera, 44, was last seen about 12:15 p.m. leaving Rutland and heading south on Route 103, Vermont State Police said in a press release Saturday.

A delivery driver for Katsiroubas Bros. Produce of Hyde Park was found shot to death Friday inside a company truck parked on the side of a highway in rural Vermont, authorities said.

Around 5:45 p.m. Friday, State Police responded to a call for a welfare check on a truck driver who was pulled to the side of Rockingham Road (a section of Route 103) in Rockingham. Fonseca-Rivera, of Boston, was found dead of apparent gunshot wounds, according to the press release.


His death is considered suspicious, but investigators believe it is an isolated incident, State Police said.

An autopsy to determine the exact cause and manner of death is scheduled for Sunday at the state medical examiner’s office in Burlington, State Police said.

The produce company is cooperating with investigators, the statement said.

On Saturday evening, Katsiroubas Bros. posted a statement on its Facebook page mourning Foscea-Rivera.

“We are deeply saddened to learn of the tragic death of our dedicated, kind and reliable co-worker, Roberto Fonseca-Rivera,” the company wrote.

State police informed the company Saturday evening that foul play is suspected in Fonseca-Rivera’s death , according to the statement.

“We hope the investigation is quick and successful. We are assisting in any way we can. We want justice for Roberto,” the statement said.

State Police would like to speak with anyone who saw the firm’s distinctive green truck on Route 103 Friday.

Anyone with information should call 802-722-4600.

Jeremy C. Fox can be reached at jeremy.fox@globe.com. Follow him on Twitter @jeremycfox. Jordan Frias can be reached at jordan.frias@globe.com