An Oregon man was eaten by his hogs when the 70-year-old farmer tried to feed them, but whether the 700-pound pigs killed the man is unclear.

Investigators with the Coos County Sheriff’s Office are trying to determine how Terry V. Garner, 70, of Riverton, Ore., died last Thursday after attempting to feed the hogs around 7:30 a.m., KPTV reported.

Garner’s family became worried when the 70-year-old man didn’t return from the farm. They then went to the hog enclosure and found the farmer’s dentures on the ground along with pieces of his body, according to NBC News.

At least one of the hogs had been aggressive with Garner before, but authorities were still determining whether the pigs murdered him.

"There are several scenarios being investigated, including that Mr. Garner had a health event, such as a heart attack, which then put him in a position where the hogs could consume him," the Coos County Sheriff’s office said in a statement. "Another scenario being investigated is that given the age and health of Mr. Garner, that one or more of the hogs knocked Mr. Garner to the ground, whereupon that hogs killed and consumed him."

Foul play has not been ruled out in Garner’s death, NBC News reported.

An examination by a pathologist was not able to determine Garner’s cause of death, the network said.

A forensic pathologist at the University of Oregon will also look into Garner’s death, which has been ruled undetermined for now, KPTV reported.