A Dallas police detective has retired after an investigation found he improperly kept thousands of family violence case files in his home and had more than 500 instances of suspects hurting victims again.

A statement from Dallas police says Det. Mickey East retired Thursday after nearly 40 years with the department.

Investigators reviewed more than 2,000 cases handled by East during his four-plus years with the family violence unit. He was reassigned to the auto pound unit in 2009.

Police say East kept more than 2,200 case files at home, while entering just 16 into an internal system and filing 217 cases. It wasn't clear whether the cases kept at home had more repeat incidents with victims.

Lt. Scott Walton said former employees don't face disciplinary hearings.