Cosmo DiNardo who confessed to killing four men now says he's killed before

The man who has confessed to killing four men in Pennsylvania now says that he is responsible for two other murders.

Philadelphia Police sources say that Cosmo DiNardo claims he was involved in at least two other killings when he was 15 years old.

Investigators say they are looking into whether the claims are legitimate.

DiNardo does have a history of mental illness and was once committed by his own family to a mental health facility.

DiNardo confessed that he along with his cousin Sean Kratz, shot the men and buried them in a 12-foot deep hole on his family's farm.

He says the men were killed after he lured them to the property with a marijuana deal.

DiNardo may avoid the death penalty because of his confession to the 4 murders.

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Quadruple murder case in Pennsylvania
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Quadruple murder case in Pennsylvania
L-R: Dean Finocchiaro, 18, Tom Meo, 21, Jimi Patrick, 19, and Mark Sturgis, 22.

(Bucks County District Attorney's Office/Handout via REUTERS)

Cosmo DiNardo is accused in the killings of four young men lured to a farm with the promise of marijuana.

(Photo: Bucks County District Attorney)

Sean Kratz, DiNardo's cousin, is charged as a co-conspirator in three of the murders.

(Photo: Bucks County District Attorney)
Cosmo DiNardo is escorted in shackles from a Bensalem police transport van into the Bucks County prison… https://t.co/cVztWRmWbV
Additional equipment brought in as authorities continue their search for four missing Bucks County men. https://t.co/BYtwQtyKqH
Bucks County District Attorney's Office photos show L-R, top row: Dean Finocchiaro, 18, and Tom Meo, 21, L-R bottom row: Jimi Patrick, 19, and Mark Sturgis, 22 as authorities say they are focusing their search for the four missing men on a sprawling farm in Bucks County, about 40 miles north of Philadelphia, Pennsylvania, U.S. on July 11, 2017. Courtesy Bucks County District Attorney's Office/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY.
Bucks County DA: Man tried to sell missing man’s car; search continues for 4 men. https://t.co/H9azZ8Nefx https://t.co/nMb3UUZn5G
Bucks County District Attorney's Office photo of Cosmo DiNardo after his arrest on Monday in Bucks County, about 40 miles north of Philadelphia, Pennsylvania, U.S. in this image released on July 11, 2017.

(Bucks County District Attorney's Office/Handout via REUTERS)
Cosmo DiNardo (L) and his cousin, Sean Kratz.

(Photo: Bucks County District Attorney)
Chopper 6 VIDEO: Search resumes at Bucks County farmland for 4 missing men https://t.co/USM8tIgf9Q https://t.co/Q7qbiESxFI
Search for four missing men in #buckscounty cont's into night. Police on rural farm in Solebury Twp.… https://t.co/iA595dqvSv
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