Stacy Peterson's Brother Back in Prison

The sex offender brother of Drew Peterson's missing fourth wife often attended the month-long 2010 hearsay hearing held to set the ground rules for evidence in the disgraced ex-cop's murder trial.

But it looks like Stacy's brother Yelton Cales won't be making it to the trial itself, as he was hauled off to prison last week to serve a three-year sentence.

Cales, 32, was locked up in Stateville Correctional Center Thursday. It was his fourth trip to prison. In the past Cales has done time for domestic battery, possession of a stolen motor vehicle and aggravated criminal sexual abuse. This time Cales was sent away for driving with a revoked or suspended license.

The charge stems from a March 2011 incident in the parking lot of a Downers Grove Best Buy.

According to Downers Grove Patch, a drunken Cales squabbled with two men in the parking lot, claimed to be armed with a handgun and spat on one of them, police said.

An inquiry to the DuPage County State's Attorney's Office about the case was not answered. A woman answering the phone there Monday morning said the air-conditioning at the Wheaton courts complex was down and everybody was going home early.

Cales is a registered sexual predator. According to a report released by the Downers Grove Police Department, in January 2005 Cales "forcefully assaulted" a 15-year-old girl. He was 25 at the time.

The teen reportedly told police that Cales held her hands above her head when he assaulted and forced himself on her.

Cales must register with the state as a sexual predator for the rest of his life.

Drew Peterson said in 2008 that during Cales' last hitch in prison, his brother-in-law called him from time to time just to talk. He also said he planned to permit the sex offender to visit his young niece and nephew—Peterson's youngest children, Anthony, now 8, and Lacy, 7—after he was released from prison, but not without supervision.

Cales' little sister Stacy Peterson mysteriously vanished in October 2007 and has yet to be found. The state police suspect Drew Peterson had a hand in her disappearance, but have yet to charge him with harming her.

The state police did charge Drew Peterson with harming his previous wife, Kathleen Savio. He was jailed in May 2009 for allegedly murdering Savio and is scheduled to go to trial on July 23. Drew Peterson is due to appear in court today for a pretrial hearing.