RENO, NV - Six months after a woman was found beaten to death in a Reno home, police believe they finally have her killer.

Edward Lewis was arrested Wednesday after an investigation stretching back to August, when his girlfriend, Suzanne Garrity, was murdered at a home on 8th Street. Police found Lewis drunk, next to her body.

But it wasn't until now that investigators got DNA and blood spatter testing back, linking Lewis to the crime.

So far, police say they don't know what the possible motive was.