Drew Peterson's pension is in jeopardy after investigators discovered several crimes unrelated to the disappearance of the former police sergeant's wife and mysterious death of his third wife, according to a report in Thursday's Chicago Tribune.

Illinois State Police Captain Carl Dobrich told the Tribune 64 officers are now assigned full-time to investigate the disappearance of Stacy Peterson and the death of Kathleen Savio.

Dobrich said in the course of the investigation, detectives discovered evidence Drew Peterson may have violated Bolingbrook Police Department policies.

Dobrich would not describe the alleged violations, but told the Tribune they were serious enough to potentially trigger the loss of Drew Peterson's $6,000 monthly pension. Under state law, a police officer's pension may be denied or revoked only if the officer is convicted of a job-related felony.

Peterson submitted his resignation last week, but Police Chief Ray McGury refused to accept it, saying he wanted Peterson fired. Bolingbrook's Police and Fire Commission later accepted Peterson's resignation.

McGury didn't disclose specifics, but alleged Peterson committed "severe" violations of departmental policies.

State police have named Peterson a suspect in his fourth wife's disappearance, and Will County prosecutors have said the bathtub drowning of Savio, 40, in March 2004 appeared to be staged to conceal a homicide.

Tips are coming in from across the nation, and the cases are the agency's top investigative priority, Dobrich said.

A grand jury convened for the Savio and Stacy Peterson probes met for the first time Wednesday and heard testimony from Scott Rossetto, a friend of Stacy Peterson.

Police contacted Rossetto after finding phone records that connected him to Stacy Peterson. Rossetto's brother dated her briefly in 2001.