The man accused of killing four young Pennsylvania men says he has killed before.
Police say Cosmo DiNardo claims to have killed two people in Philadelphia.
Investigators there are looking through files to see if anything matches up.
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DiNardo claims he killed a man and woman years ago, but did not know their names.
According to NBC Philadelphia, prosecutors said DiNardo is schizophrenic, not allowed to have firearms and was involuntarily committed to a mental institution.
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