This combination of undated photos provided by the Bucks County District Attorney's Office shows four men who went missing last week: Tom Meo, top left; Jimi Tar Patrick, bottom left; Dean Finocchiaro, top right; and Mark Sturgis, bottom right.
All four men were shot and killed and then buried on the sprawling property owned by Dinardo's parents in Solebury Township that has been at the center of the investigation, according to a statement from the Bucks County district attorney's office.
DiNardo and Kratz, of Northeast Philadelphia, are charged with the July 7 slayings of Dean Finocchiaro, 19, of Middletown Township, Bucks County; Thomas Meo, 21, of Plumstead Township, Bucks County; and Mark Sturgis, 22, of Pennsburg, Montgomery County.
DiNardo, 20, was first arrested Monday and held on $1 million bail on an unrelated gun charge before his father paid $100,000 to bail him out Tuesday.
Dinardo was charged with four counts each of criminal homicide, conspiracy to commit homicide, three counts of robbery and abuse of a corpse.
The bodies of the slain men are being held in a secure place, Weintraub said.
The next day, Kratz and DiNardo returned to the scene to bury the three men in 12 ½-foot deep holes.
On Wednesday afternoon, Weintraub said investigators had found a auto allegedly stolen from one of the missing men and charged DiNardo with theft.
Kratz alleges that DiNardo shot Finocchiaro, the affidavit said.
Cosmo DiNardo, who graduated from a Catholic prep school two years ago, said he killed a former schoolmate when he arrived with $800 to buy $8,000 worth of pot.
"We've brought four young men one step closer to their loved ones so that they may rest in peace", Weintraub said.
"These boys can finally go home to their families", Weintraub said.
Shortly after, Dinardo and Kratz allegedly planned to pick up Meo and Sturgis, take them to the large property and then rob them.
That same night, DiNardo told authorities he arranged a deal with Meo.
"Every death was related to a purported drug transaction, and at the end of each one there's a killing", the person said. Dinardo then ran over Meo with a backhoe before using it to lift both Meo and Sturgis' bodies into a metal tank where he already had placed Finocchiaro's body.
Bucks County District Attorney Matthew Weintraub speaks during a news conference at the Bucks County Courthouse in Doylestown on Friday, July 14, 2017.
At a press conference early Thursday morning, shortly after midnight, Weintraub addressed DiNardo, saying, "I feel that we bought ourselves a little bit of time in charging Mr. DiNardo with the stolen auto case today and getting that 5 million dollar bail".
He said he does not know why DiNardo killed the four men - an answer many are searching for.