Drew Peterson's Son: He 'Probably' Killed Stacy, Kathleen Savio

BOLINGBROOK, IL -- Almost five years after former Bolingbrook cop Drew Peterson was convicted of murdering third wife Kathleen Savio, son Stephen Peterson acknowledges that his dad "probably" killed both Savio and missing fourth wife Stacy Peterson.

The younger Peterson -- who is now reportedly living his in father's former home and raising his dad's children with Stacy -- told the Chicago Tribune that his father likely killed both wives.

Stephen Peterson was reluctant to say his father is guilty, but told the paper, "Over time, you hear enough (from police). They can't all be full of s--- ... I'm sure he did it."

Drew Peterson was convicted not only of murdering Savio, who was found dead in a dry bathtub in March 2004, but also of ordering a hit on Will County State's Attorney James Glasgow. He was sentenced to 38 years at Menard Correctional Center for killing Savio and another four decades for the failed jailhouse plot against Glasgow.

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Stacy Peterson disappeared three and a half years after Savio's death and has never been found.

Stephen Peterson said he doesn't know what happened to Stacy, and said he still loves his dad, who continues to profess his innocence, the Tribune reported.

A former Oak Brook police officer, Stephen Peterson also spoke out during the Jan. 3 episode of Lifetime Television show "Monster in My Family." Since losing his job in 2011 and the end of his father's pension payments last summer, he told the Tribune he needed the $10,000 he received for doing the show.

The full episode will be available on the Lifetime website until March 25, according to the network. Lifetime also produced the 2012 TV movie "Drew Peterson: Untouchable," based on Patch editor Joe Hosey's book "Fatal Vows: The Tragic Wives of Sergeant Drew Peterson."

WATCH: A clip from "Monster in My Family" shows Stephen Peterson meeting with Kathleen Savio's sister Sue Doman for the first time since Savio's funeral:

Patch file photo of Stephen Peterson