Update: Drew Peterson Packed Off to Indiana Federal Prison

Notorious wife-killing cop Drew Peterson was packed off to a federal prison in Terre Haute, Indiana, but no one is saying why.

Peterson, 63, had been locked up in maximum security Menard since February 2013 for the 2004 murder of his third wife, Kathleen Savio. He was moved from Downstate Menard to the Northern Illinois Reception Center at Stateville, according to prison records, and is now in the Terre Haute Federal Correctional Institution, said Jill C. Tyson, the chief public information officer for the Federal Bureau of Prisons.

Tyson said she would provide no further information Tuesday.

Illinois Department of Corrections spokeswoman Nicole Wilson said Peterson was “transferred under the terms of the Interstate Compact Agreement."

Peterson was still listed as a "temporary resident"of the Illinois Department of Corrections on Tuesday.

Former Peterson attorney Joseph "Shark" Lopez said he did not know why Peterson was transferred into federal custody.

"I've never seen anyone taken out of state custody and put into federal custody," Lopez said.

"I've seen vice versa," he said. "It's a very unusual situation.

Peterson attorneys Steve Greenberg and David Peilet did not return calls for comment. Greenberg told WGN that he did not know his client had been transferred.

Last year, while serving his sentence for killing Savio, Peterson was convicted of conspiring to have Will County State's Attorney James Glasgow murdered.

Peterson was sentenced to 38 years in prison for killing Savio and 40 years in prison for supposedly attempting to orchestrate Glasgow's murder.

Peterson's fourth wife, Stacy Peterson, vanished in October 2007. She remains missing.

The Illinois State Police named Peterson a suspect in Stacy's "potential homicide" but have yet to actually charge him with harming her.

Image via Illinois Department of Corrections