A second person was arrested Thursday in the case of four missing Pennsylvania men. Sean Kratz was arrested as an accomplice to Cosmo DiNardo, who confessed to either the “participation in or commission” of the murders of the four men.

Kratz, 20, was taken into custody mere hours after DiNardo  admitted his involvement. In exchange for his confession, DiNardo, 20, prosecutors agreed not to pursue the death penalty against him. DiNardo reportedly named Kratz as part of the agreement, a source told the  Philadelphia Inquirer.

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Kratz allegedly used construction equipment to bury the four bodies, according to WPTS.

Kratz was out on bail on separate charges before his arrest in connection to the case. He had two burglary cases pending in the Philadelphia court system, the Inquirer reported. In the first, Kratz was charged with burglary, criminal trespassing, theft and receiving stolen property, among other charges in the 2016 case. The second charged him with conspiracy, burglary, trespassing, theft and other charges in an incident that took place about six months prior.

Jimi Patrick, 19, Tom Meo, 21, Mark Sturgis, 22, and Dean Finocchairo, 19, all went missing sometime last week. The remains of at least one of the men, Finocchiaro, were located on a 68-acre property belonging to DiNardo’s parents. Authorities said they were working to determine who the rest of the remains inside the 12-foot deep grave belonged to.

Bucks County District Attorney Matthew Weintraub had not yet commented on Kratz’s arrest or DiNardo’s confession.

DiNardo did not explicitly say whether he killed the men himself, his attorney Paul Lang said in relaying his client’s confession. An unidentified source, however, told the Associated Press that DiNardo said he killed the men at separate times after selling them marijuana and then burned their bodies at the family farm. One victim was killed July 5 while the other three were killed July 7, the source said.

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DiNardo, who reportedly suffered from schizophrenia, killed the men because he felt cheated or threatened during drug transactions, the AP report said.

“Every death was related to a purported drug transaction,” the unidentified source said. “And at the end of each one there’s a killing.”