At a midnight Wednesday news conference, Weintraub announced that investigators had recovered the remains of Dean Finocchiaro, 19, of Middletown, in a "common grave" on a farm owned by the family of Cosmo DiNardo.
The 19-year-old from Newtown was last seen on Wednesday, July 5.
Earlier Wednesday, Weintraub said police would "continue digging and searching that property until we're satisfied that they are not there".
Yesterday, police executed a search warrant with cadaver dogs on DiNardo's family farm and discovered a mass grave containing multiple victims.
"We're not going to rest until we get through every inch of that property", Weintraub said, according to The Associated Press. The other three are identified as Mark Sturgis, 22, Thomas Meo, 21, and Jimi Tar Patrick, 19. According to the Inquirer, though, he and Patrick both attended Holy Ghost Preparatory School in Bensalem, Pennsylvania, while DiNardo and Finocchiaro both were interested in ATVs and were in at least one Facebook group together about quad bikes.
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Local and state police and the Federal Bureau of Investigation had embarked on an "all hands on deck" foot-and-air search of the farmland, which is owned Antonio and Sandra Dinardo.
"We're going to start looking seriously at the homicide charges and in fact we already have pursued that option", Weintraub said, noting he could not comment on the type of homicide.
The "all hands on deck" investigation into their whereabouts, including local and state police and the FBI, has centered on a farmland property in Solebury Township owned by Antonio and Sandra Dinardo.
Authorities found the vehicle on Sunday, along with Meo's auto keys and title, in a garage on a Solebury Township property owned by DiNardo's parents, Weintraub said. Dinardo tried to sell the vehicle to a friend for $500, a criminal affidavit states.
The connection between the missing men is more established. A judge ordered him held on $5 million bail. Meo was never known to go anywhere without his medication.
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DiNardo was in custody on unrelated charges Monday and was named a person of interest in the case on Tuesday before posting 10 percent of his original $100,000 bail. Meo's girlfriend last spoke with him through text messages on Friday night, shortly before 7 p.m.
In the gun charge he still faces, DiNardo is accused of illegally possessing a shotgun and ammunition because of a previous involuntary commitment to a mental health institution.
"This investigation is still wide open", Weintraub said. Meo, his friend said, is "the most good-hearted, loyal, hard-working young man I've ever met in my life". The other three disappeared Friday.
Finocchiaro, Meo and Sturgis all knew each other, the AP reported, and news outlets have reported that cars belonging to two of the men have been located.
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