Police say that, out of the remains found in a 12-foot grave on DiNardo's farm, they've only been able to identify Finocchiaro.
Jimi Taro Patrick, of Newtown Township, went missing around 6 p.m. Wednesday, July 5, 2017, his parents reported to township police.
The person with knowledge of the confession said one of the men was killed July 5 and the other three were killed July 7.
Finocchiaro's body was found 30 miles north of Philadelphia in a twelve-and-a-half-foot grave, along with other, unidentified remains.
After Finocchiaro went mysteriously missing, DiNario's acquaintances reached out to him via Snapchat.
The person spoke to The Associated Press on the condition of anonymity on Thursday because he was not authorized to publicly discuss details of the case against 20-year-old Cosmo DiNardo, who was in custody.
On Wednesday, DiNardo was arrested for the second time in three days after he allegedly tried to sell a vehicle belonging to Meo of Bensalem for $500.More news: Liverpool join Chelsea in race to sign Gabonese striker Pierre-Emerick Aubameyang
Meo and Sturgis followed DiNardo to the Solebury property in Meo's Nissan Maxima, DiNardo told investigators.
When the prosecutor held a midnight Wednesday news conference to announce the discovery of remains, Claire Vandenberg, of neighboring New Hope, gathered around a TV with a group of friends to hear developments on what she said is "all we talk about".
DiNardo reportedly said he killed the men separately after selling them marijuana and then burning their bodies at his family's farm in Solebury. He is charged in the deaths of all four men.
According to court documents, DiNardo and Kratz planned to sell $700 worth of marijuana to Finocchiaro on Friday but instead chose to rob him. "We just don't know how many homicides", Weintraub said at his middle-of-the-night news conference.
Attorney Paul Lang refused to say whether DiNardo killed the young men, who disappeared last week.
- Later that day, Meo and Sturgis met similar fates in their pursuit of weed.
It's not clear why Dinardo cooperated.More news: Redrow plc (LON:RDW) has analysts on the Bullish side this week
He wrote on Snapchat: "I mean I know the kid but yeah I feel bad for his parents".
Dinardo then drove the backhoe over Meo and "basically crushes him", Kratz told police, according to the complaint. They then walked to a remote part of the property where DiNardo said he fatally shot Patrick with a.22-caliber rifle.
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.
On Monday, Dinardo was arrested for an unrelated charge of possessing a firearm despite suffering from a mental illness.
"I'd like to think that he wanted to help us get these boys home". He then drove the backhoe over Meo, picked up both Meo and Sturgis, and threw them in the same "metal tank" as Finocchiaro - poured gas, lit a fire.
Weintraub confirmed that the remains of all four men have been found. DiNardo is suspected to have known Patrick through school - they both attended the same Catholic High School for boys.
The families of the victims agreed to take the death penalty off the table in exchange for his confession, according to Bucks County Assistant District Attorney Gregg Shore.More news: Twitter goes berserk as Mithali Raj scores sixth ODI century
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