Former police sergeant Drew Peterson is shown in this May 7, 2009 booking photo.

Former police sergeant Drew Peterson is shown in this May 7, 2009 booking photo. (Will County Sheriff's Dept. / September 7, 2012)

Former police sergeant Drew Peterson was arrested Thursday in connection with the murder of his third wife, Kathleen Savio, according to police.

A law enforcement source said Peterson was arrested after a traffic stop near his home Thursday.

When reached early Thursday evening, Peterson's attorney, Joel Brodsky, said he was unaware of the arrest.

"You know more than I do. I'm on a plane it's taking off in 5 minutes to go to NYC. I guess they'll have a bond hearing Monday," he said.

On March 1, 2004, Savio, 40, was discovered by neighbors in her Bolingbrook home in an empty bathtub with a 1-inch gash on the back of her scalp.

Savio and Peterson were divorced but the details of the divorce settlement were weeks away from being finalized when she died.

An autopsy at the time determined she drowned, and a coroner's jury ruled months later--based largely off the testimony of state police--that the death was accidental.

Authorities reopened Savio's case after Peterson's fourth wife, Stacy, disappeared in October 2007.

The next month, Savio's remains were exhumed, and in February 2008, Will County State's Atty. James Glasgow said the second autopsy determined her death was a homicide. He classified the case as a murder investigation.

While authorities never named Peterson a suspect in her death, the same Will County grand jury that had been investigating Stacy Peterson's death was also investigating the Savio case.

Last month, relatives representing Savio's estate filed a wrongful death lawsuit against Peterson seeking in excess of $300,000 for causing her death, losses arising from it and the injuries she suffered prior to her murder.

Peterson, 55, was a 29-year veteran of the Bolingbrook Police Department. After his current wife disappeared, he was suspended from the department and he submitted his resignation shortly afterward. He draws a $6,068 monthly pension.

The saga captured the attention of the national media, which scrutinized every development in the investigation, including Peterson's love life, who openly dated young women and once had a 24-year-old woman he called his fiance move in with him for a short time.

Drew Peterson was supposed to fly to Reno on Friday to spend a weekend at the famous Moonlite BunnyRanch, where he was expected to meet owner Dennis Hof to talk about job possibilities.

Hof had said earlier Thursday that planned to offer Peterson a job as head of security at the Nevada brothel.

When reached at his Bolingbrook home early Thursday afternoon, Peterson declined to comment.

Will County State's Atty. James Glasgow announced in a news release that he and Illinois State Police Capt. Carl Dobrich will hold a news conference at 8:30 p.m. on the murder indictment issued against Peterson.

The briefing will be held at State Police District 5 Patrol Headquarters in Lockport.