Kill Switch (2008)

A psychopathic killer is ravaging Memphis, Tenn., by murdering young women, and Detective Jacob Stillwell (Steven Seagal) is on the case. Known as the resident tough cop due to his aggressive tactics, he gets knocked sideways when his girlfriend becomes one of the murder victims. With his partner, Storm Anderson (Chris Thomas King), in tow, Jacob casts the rules aside and infiltrates the seedy criminal underworld of the city looking to avenge his lover's death and put an end to the killings.