St. Louis County (KSDK) - Police have made an arrest in the death of a St. Louis County police security officer.

Firefighters found the body of51-year-old Deirdre Exum inside her burning home in Spanish Lake Friday night. She had been beaten to death.

Police say this was not a random act and are questioning a man in custody.

Charges have not been filed.

Exum worked with the St. Louis County Police Department for the past four years and leaves behind one son.