The man accused of murdering a woman and her two teenage children in Rock County has a record of violent crime.
James Koepp is being held in the deaths of Danyetta Lentz, her 17-year-old daughter Nicole and 14-year-old son Scott.
The 47-year-old Koepp is a registered sex offender who lived near the family in a mobile home park just outside Janesville.
Koepp was convicted of 4 counts of second-degree sexual assault in the 1980s. A criminal complaint says Koepp sexually assaulted two women at a drug and alcohol treatment center in Madison in March 1982.
He was released from prison in 1993 to begin serving probation. But, he was sentenced to another 6 years in prison after his probation was revoked by the state Department of Corrections.
Rock County District Attorney David O'Leary says he plans to file 3 charges of first-degree intentional homicide against Koepp this week.