The man suspected of killing four young men in Bucks County, Pennsylvania may have murdered before, according to his own confession. Cosmo DiNardo, 20, told police he killed other people in the years leading up to the grisly deaths of the four missing men, a source told WCAU Tuesday.

While making his confession to police, DiNardo claimed he had killed two people in Philadelphia when he was a juvenile, according to WPVI.

DiNardo confessed to his role in the deaths of Jimi Patrick, 19, Tom Meo, 21, Mark Sturgis, 22, and Dean Finocchiaro, 19, last week. He revealed the locations of all four bodies and named his cousin, Sean Kratz, as an accomplice. In exchange for the confession, prosecutors vowed not to seek the death penalty against DiNardo. As part of the confession, he admitted to the two other murders, sources told local news outlets.

Read: Everything We Know About Murders Of Four Missing Pennsylvania Men

Now, however, police want to find out if there is any truth to his claims about having killed before.

“Given what he was already been accused of, it’s certainly a possibility,” Philadephia Police Commissioner Richard Ross told WCAU Tuesday. “We would be remiss if we didn’t investigate further.

Philadelphia homicide detectives had not yet spoken to DiNardo as of Tuesday morning, Ross noted, and couldn’t independently verify his claims or their timeline.

“In order for us to lend any credence to it, we would have to talk to him directly,” said Ross. “When you’re dealing with someone who is pathological like that, you don’t know where he is coming from.”

DiNardo’s attorneys refused to comment about his claims or the current case against him.

Both DiNardo and Kratz were charged with criminal homicide Friday. DiNardo, however, was no stranger to law enforcement at the time of his arrest. The 20-year-old had contact with police more than 30 times since 2011, a law enforcement source told ABC News. The first incident involving DiNardo and police came when he was just 14.

And it’s not the first time his name has come up in relation to murder. An unidentified friend of DiNardo’s told the Philadelphia Inquirer last week that DiNardo had spoken of killing in the past.

“He’s told me and my friends, ‘Yeah, I’ve killed people before, I just haven’t been caught,’” the source said. “We literally were just like, ‘Yeah, all right Cosmo, sure you did.’ No one actually thinks someone’s capable of this.”

Read: Cosmo DiNardo Motive: Why Were Four Missing Pennsylvania Men Killed?

According to DiNardo’s confession, the murders of all four men took place during or after he sold them marijuana. As for any further motive, authorities have yet to figure that out. Bucks County District Attorney Matthew Weintraub said investigators were still working to discern how minor marijuana deals led to the deaths of the four young men.

“I’m not sure,” he said, “we could ever answer that question.”

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