HOPE, Pa. -- A Pennsylvania man has confessed that he was involved in the deaths of four missing men in eastern Pennsylvania, his lawyer said Thursday.
Cosmo DiNardo, 20, confessed to "his participation or commission in the murders of the four young men," attorney Paul Lang said.
Bucks County prosecutors promised not to seek the death penalty in exchange for his confession, Lang said.
DiNardo told authorities where to find the bodies, the lawyer said. He declined to directly respond to questions of whether DiNardo killed the men.
"That will come out in time," he said.
DiNardo was arrested earlier this week on charges stemming from the investigation.
His parents own the sprawling suburban Philadelphia property where the body of one of the missing men was found Wednesday.
His confession came as investigators worked to excavate the 12-foot-deep grave where the body was found along with other human remains.
The body was identified as belonging to Dean Finocchiaro, 19. Additional human remains were found inside a "common grave" but haven't been identified, Bucks County District Attorney Matthew Weintraub said Thursday.
"We are not done yet. This is a homicide, make no mistake about it," Weintraub said. "We just don't know how many homicides."
Finocchiaro, who was last seen at about 6:30 p.m. Friday, was one of the four young men who mysteriously disappeared last week.
The "all hands on deck" investigation into their whereabouts centered on a farmland property in Solebury Township owned by Antonio and Sandra Dinardo.
The Dinardo family owns the cement and construction company Cosan. Cadaver dogs led authorities to discover the grave on the property Wednesday, Weintraub said.
"We are going to bring each and everyone one of these lost boys home to their families, one way or another," Weintraub said.
Finocchiaro and the three others went missing over several days last week within miles of each other.
The first to vanish was Jimi Patrick of Newtown Township. He was last seen at 6 p.m. on July 5 and was reported missing the next day after he had no contact with friends or family.
Police say the Loyola University Maryland student, 19, also didn't show up for work. He was a beer runner at a restaurant-bar in nearby Doylestown, WPVI-TV reported.
"He was on the shyer side, but you would get a smile out of him, a little conversation," bartender Jennifer Albrecht told WPVI.
Patrick graduated from Holy Ghost Preparatory School in 2016, where Dinardo was also a graduate in 2015, school spokesman Bill Doherty said.
Two days later after Patrick disappeared, Finocchiaro, Mark Sturgis, 22, of Pennsburg, and Thomas Meo, 21, of Plumstead Township went missing.
Close friends Sturgis and Meo were last seen near the Doylestown area in Bucks County, KYW-TV reported. Both young men did not go to work on Saturday, police said.
Meo's girlfriend told investigators that she had been texting with him on Friday until just before 7 p.m. After that, she had no contact with Meo, which was "out of the ordinary and not common," court documents said.
The men's disappearances have shaken the community. About 100 residents and reporters gathered at a shopping mall a few miles from the property waiting for updates about them.
"We've been monitoring everything on Twitter. We wanted to be supportive and comforting for our community," said Bucks County resident Wyatt McLeod.