Police arrested 21-year-old Tysean Forsythe while investigating a stolen car on Wednesday.
Heather Rainey, 47, was found shot in the chest on the 700 block of West Poplar Street on June 22.
Police say Rainey was found shot to death in the street around 11 p.m. Her car was found running nearby with the windows smashed out and a hammer sitting on top.
Police had previously released a picture of two men wanted for questioning in the murder case. It is unclear if Forsythe is one of the men in the photo.
Rainey's family previously told Action News that they don't know why she was targeted but believe the killer was trying to steal her car.
Officials have not commented on the possible motive for the killing.
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