Cadaver dogs led authorities to a “common grave” where they found the body of one of four men missing in suburban Philadelphia since last week, Bucks County District Attorney Matthew Weintraub said.ABC News reported that Tom Meo, 21, Mark Sturgis, 22, Dean Finocchiaro, 19, and Jimi Tar Patrick, 19, all disappeared from their Pennsylvania towns last week.Weintraub said Finocchiaro’s remains were recovered from a 12 ½ foot grave “painstakingly dug” by investigators “with a lot of care so not to damage any potential evidence”. Police found human remains on the family property of a man they had identified as a person of interest.22-year-old Mark Sturgis of Pennsburg, Montgomery County was last seen leaving his home on Walt Road in Pennsburg around 6:00 pm Friday, according to Sturgis’ father.Thursday, the lone person of interest in this case, 20-year-old Cosmo Dinardo confessed to killing the men and hiding the bodies.”He confessed to his participation or commission in the murders of the four young men”.DiNardo’s confession pertains to the disappearance of four men in the Philadelphia area over the past week. DiNardo, whose family owns THIS farmland, was arrested for an unrelated gun charge this week. but he was released late Tuesday after posting bail. “We’ve been treating this from the outset as a criminal investigation, and nothing has deterred that to this point”, Weintraub said.Dean Finocchiaro (left), 18, has been identified as one of the bodies found on a Pennsylvania farm.Attorney Paul Lang told reporters the confession came after the district attorney promised not to seek the death penalty.Jimi Taro Patrick, 19, of Newtown Township, is last seen. According to an affidavit of probable cause, DiNardo was accused of possessing a shotgun and ammunition despite a history of mental illness that includes a voluntary commitment. Kratz was held at Northeast Detectives Thursday for Bucks County authorities to pick up and question. DiNardo was taken into custody on Wednesday on receiving stolen property charges for the alleged theft of a vehicle belonging to Meo.At least three of the men knew each other.Lang told ABC News that DiNardo felt “deep remorse” and was “very emotional”.Weintraub said he could not comment on whether or not police believe Finocchiaro’s killer worked alone.