Joseph Kopacz, 54, was convicted Nov. 8 on state charges of committing the home-invasion attack in October 2016 in Cook County, Illinois, the FBI said in a statement.
"Kopacz attempted to sexually assault a victim who had been asleep in the home during the home invasion," said Laura Eimiller, a spokeswoman for the bureau. He fled while on bond during his trial.
After it was determined that the convict had left Illinois, authorities in December charged him with unlawful flight to avoid confinement.
Agents @FBIChicago & @FBILosAngeles are seeking Joseph Kopacz who was convicted in absentia of a 2018 home invasion sex assault in #CookCounty Illinois. Kopacz, a registered sex offender, fled while on bond & may be traveling in Riverside County. Claim reward up to 5k. #Wanted pic.twitter.com/D66qWmsHXe— FBI Los Angeles (@FBILosAngeles) January 11, 2019
"Kopacz is believed to have been in contact with associates in Riverside County and may be traveling in Southern California," Eimiller said.
He is described as white, 6 feet, 1 inch tall, weighing 190 pounds, with brown hair and brown eyes and a scar on his lower right arm.
A reward of up to $5,000 is being offered in exchange for information leading to Kopacz's arrest.
Anyone with information regarding the fugitive's whereabouts is urged to FBI's field office in Los Angeles at (310) 477-6565 or Chicago at (312) 421-6700.