(CBS/AP) SAN DIEGO - Investigators believe that Brittany Killgore, a Marine's wife, was killed after refusing to take part in sadomasochistic sex at a northern San Diego County home, according to documents released Wednesday.
In the documents, which included search warrant affadavits, investigators say the 22-year-old Killgore apparently didn't know about the sexual lifestyle of Marine Staff Sgt. Louis Perez when she accepted his invitation to a dinner cruise on April 13.
Investigators say they found an apparent "sex dungeon" along with whips, knives and sex toys at the Fallbrook home where Perez allegedly took Killgore. Authorities say she was strangled.
According to CBS affiliate KFMB, one search warrant reveals that officers found a copy of "slave rules," along with a copy of a "slave contract," as well prescription drugs and various types of saws.
In a affidavit, the station reports, a detective writes "because of Perez, Maraglino and Lopez's unusual sexual fetishes I believe they may have accosted Killgore for these reasons."
The Camp Pendleton Marine and two women, Dorothy Maraglino and Jessica Lynn Lopez, have pleaded not guilty to murder.
Three days before she died, Killgore had filed for divorce from her husband, who was in Afghanistan.