CHICAGO (CBS) — Letters written by a prison inmate allege Will County State’s Attorney James Glasgow was in on the planning of his own murder-for-hire, leading to new charges against the man he put in prison, convicted killer Drew Peterson.

In two handwritten letters an inmate sent to Peterson’s former attorney, Joel Brodsky, the alleged plot to set up Peterson was laid out in detail; how an inmate befriended Peterson, and then schemed to entrap him. The inmates involved in the alleged setup were looking for better deals for themselves.

According to the inmate who sent the letter, Peterson spoke to a second inmate about his missing third wife, Stacy, and said, “I dumped her in Lake Michigan.” Drew Peterson is a suspect in Stacy’s disappearance, but has not been charged. Stacy Peterson’s body has never been found.

In 2012, Drew Peterson was convicted of killing his third wife, Kathleen Savio.

Serving 38 years in prison for Savio’s murder, Peterson has since been charged with solicitation of murder for hire, for allegedly trying to hire a hitman to kill Will County State’s Attorney James Glasgow, who prosecuted the Savio case.

The inmate who wrote the letters claims he was a cellmate with the man who recruited him in the alleged plot to set up Peterson. The inmate alleges Glasgow was in on the planning, along with other prosecutors, the FBI, and officials at the Illinois Department of Corrections. He said he has notes to prove it.

He claimed the other inmate involved was transferred from one prison to another to continue the plot, following a meeting with Glasgow, another prosecutor, FBI agents, and IDOC officials. He said the other inmate wore a wire while talking to Peterson.

Glasgow’s office said he has no comment on the allegations Peterson was set up.

The inmates letters to Brodsky are below, with the inmates’ names redacted: