The prime suspect was Frank Wright. Wright allegedly argued with Anagnos earlier in the night. He was ejected from the bar.
There were no independent witnesses to the attack, so the Riverside District Attorney's Office did not file charges against Wright, investigators said. In addition, technology at the time could not connect Wright to the murder.
Sheriff's cold-case investigators closed the case in August after linking Wright to the murder through DNA tests conducted on hair found on the Anagnos's hand.
Wright died in 2002 from alcohol abuse.
The Riverside County Sheriff's Dept. Cold Case Unit is currently examining more than 70 unsolved cases that may have DNA evidence.