Lewis Edward Reeder has been arrested.
Fairfax County Police report Reeder was arrested near Richmond on Thursday. Detectives say the arrest followed a tip from a member of the community.
Reeder is accused of setting his girlfriend on fire twelve days ago in the Alexandria section of Fairfax County. Sixty-four-year-old Delores Williams died from her burns in a hospital Wednesday night.
Detectives believe Reeder set fire to Williams after arguing with her in the house that they shared in the 4900 block of Keeler Court. Firefighters discovered the badly burned woman after receiving a report of a fire and a disorderly man at the house.