The remains were found buried behind the North Dartmouth, Massachusetts, home of the ex-wife of longtime fugitive Donald Eugene Webb, police said.
Last month, the widow of the slain police chief sued Webb's wife, saying investigators had recently found a hidden room in her MA home where Webb may have hidden from authorities a decade or more after the shooting.
Little is known about Webb's whereabouts from the time of the murder until his own death, which officials now believe occurred in 1999.
Webb, who had been among the longest tenured fugitives on the FBI's Most Wanted list, is alleged to have killed Saxonburg Police Chief Gregory Adams in Saxonburg, Pennsylvania, Dec. 4, 1980, after what police believe was a routine traffic stop.
Adams was shot in Saxonburg during a routine traffic stop around 2:50 p.m. on December 4, 1980, and later died of his injuries.
He disappeared after the shooting.More news: McDonald's giving away free ice cream for National Ice Cream Day
The state medical examiner positively identified the remains on Friday, according to the Federal Bureau of Investigation.
"It's the biggest question mark in our town's history, so we're hopeful we'll see what happens in the next short time here", Chief Beachem said. "Our thoughts are with the family and we hope this eases their minds, if even only slightly".
Last month, the widow of the slain police chief sued Webb's wife, saying investigators had recently found a hidden room in her MA home where Webb may have hidden from authorities a decade or more after the shooting. A $100,000 reward was being offered for information that led to his arrest.
Authorities are digging for evidence in murder case involving a missing police chief, who was murdered in 1980. His remains were found Thursday night on the property of his former wife, Lillian Webb.
Webb's ex-wife did not come to the door when NBC Boston knocked on Friday. One woman driving by says she and Lillian used to be good friends. "That's all", Johnson said.