Killings of 5 men in California are linked, police say

Rewards totaling $85,000 have been offered for information leading to an arrest in five fatal shootings since July in Stockton, California, that investigators believe are related, police said.

After reviewing surveillance footage, detectives have located an unidentified "person of interest" in the killings, Stockton Police Chief Stanley McFadden wrote on the department's Facebook page Saturday. Police released a grainy still image of a person filmed from behind, dressed all in black and wearing a black cap. 

Police told CBS News there is also firearm evidence linking the murders together.