Police said they can not confirm yet if the other remains belonged to the three other people who went missing - namely 19-year-old Jimi Tara Patrick, 22-year-old Mark Sturgis, and 21-year-old Tom Meo.
"We have found human remains in an approximately 12-and-a-half-foot deep common grave", said Bucks County District Attorney Matt Weintraub.
Two of the men, 22-year-old Mark Sturgis and 21-year-old Tom Meo, are longtime friends who work in construction for Sturgis' father, Mark Potash.
Meanwhile, their 20-year-old son Cosmo DiNardo has posted 10% of $1 million bail on a gun charge unrelated to the case of the missing men.
In their search for the missing men, local, state and federal investigators have been combing a property in Solebury Township, Bucks County, that is owned by DiNardo's family.
SKYFOX was over the DiNardo's New Hope property Tuesday as authorities surrounded around a deep trench, apparently dug with the help of a backhoe, as officers gathered up dirt and ran it through sifters.
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"We're going to see this investigation through to the end", said the district attorney.
Clockwise from top left, reported missing July 5-7, 2017, in Bucks County were Dean Finocchiaro, Tom Meo, Mark Sturgis and Jimi Patrick.
Finocchiaro's remains were found, Weintraub said in a press conference early Thursday.
There's been another stunning development in the case of four missing men in Bucks County, Pennsylvania.
Positing that DiNardo who was Facebook friends with one of the victims and had a previous outstanding firearms warrant against him, authorities brought DiNardo in on Monday as they sought to "explore" possible involvement. Inside the vehicle, police found Meo's diabetic kit, which Meo's parents said their son could not survive without.
DiNardo, who the court heard is schizophrenic, is being held on $5 million bail after his second arrest.
DiNardo was originally arrested earlier this week over illegally possessing a shotgun and ammunition on a charge filed back in February, but was bailed.