CRANDON, Wis. (AP) -- A claim filed by the family of one of the six people killed in a Forest County shooting rampage attempts to hold the gunman's employers accountable for the crime.

The claim, filed on behalf of Jordanne Murray's family, says Tyler Peterson's supervisors at the Forest County Sheriff's Department and Crandon Police Department knew he was prone to violence before he killed six young people.

Peterson later took his own life.

Both law enforcement agencies employed the 20-year-old Peterson.

Attorney David Blau alleges Police Chief John Dennee and Sheriff Keith Van Cleve knew Peterson had acted out violently in the past.

Blau was not specific.

Dennee and Van Cleve have claimed Peterson showed no previous tendencies toward violence.

Murray, 18, Aaron Smith, 20, Bradley Schultz, 20, Lindsey Stahl, 14, Lianna Thomas, 18, and Katrina McCorkle, 18, were killed Oct. 7.