Sean Michael Kratz's Bucks County Mugshot

Twenty-year-old Cosmo DiNardo has been charged with the murder of all four and investigators now say he had an accomplice Sean Kratz who is charged with three counts of homicide.

Paul Lang, DiNardo's lawyer, had told reporters Thursday that the 20-year-old was ready to plead guilty to four counts of first-degree murder.

However, the district attorney said that only Dinardo has been charged in the death of Jimi Taro Patrick, 19, of Newtown Township, while both will face charges for the deaths of Dean Finocchiaro, 19, of Middletown Township; Thomas Meo, 21, of Plumstead Township; and Mark Sturgis, 22, of Pennsburg, Montgomery County. Bucks County D.A. Matt Weintraub, at a news conference Friday afternoon in Doylestown was confident about the charges and the overall investigation.

After killing the men, DiNardo confessed to burning the bodies in a metal tank that was converted into a cooker that he labeled a "pig roaster", according to The Daily Mail.

The Bucks County District Attorney has positively identified the bodies of four young men who were missing in Pennsylvania. The three men drove to DiNardo's family's property, where Kratz shot him in the head.

"When they (Meo and Sturgis) turned their backs on me, I shot Tom in the back", Dinardo allegedly told detectives questioning him, according to a criminal complaint. Patrick came with $800, and Dinardo told him he could sell him a shotgun for that price instead.

ABC accessed the court documents with the full confessions of DiNardo and his cousin Sean Kratz, who has also been arrested and charged for involvement in the murders.

The person with firsthand knowledge of DiNardo's confession said the men were killed after DiNardo felt cheated or threatened during three drug transactions.

Officials gave no indication of a motive for the killings, but DiNardo, who suffered from mental illness, has had multiple run-ins with local police, and an acquaintance said he had talked about killing people.

The 90-acre farm property was used as a killing field. Patrick's body was found in a separate grave late Thursday.

The location is less than 2 miles from the location where Meo's vehicle was found in the garage of DiNardo's parents property on the 2800 block of Aquetong Road and less than a mile from where Mark Sturgis' vehicle was found in Peddler's Village, which is a tourist destination.

Did the four men know each other? In exchange for that confession, prosecutors agreed not to seek the death penalty against him.

The four men went missing over several days last week near Philadelphia.

"I can tell you, for I've been there, we'd still be looking for Jimi Patrick had we not made this agreement", Weintraub said.

Dinardo and Kratz are cousins, the criminal complaint states.

Court papers indicate DiNardo then crushed Meo with the backhoe, and Sturgis was fatally shot as he ran.

Dinardo's parents own a construction and cement company called Cosan LLC.

DiNardo was initially arrested on Monday on charges relating to illegal possession of a shotgun and ammunition.

Mr. Harran said DiNardo had been sent involuntarily to a mental hospital last summer, at the request of a family member, but said he did not know the details, or how long he was held there.

Cosmo Dinardo wrapped the body of Dean Finocchiaro in a blue tarp last Friday night and attempted to drag the victim out of his family's Bucks County barn until the tarp got stuck on a nail. Meo, 21, and Sturgis, 22, were friends and coworkers.

Kratz said the men were talking about the weed sale when DiNardo used the handgun to shoot Meo in the back and fire on Sturgis.

Vanessa Coleman