Police in California search for possible serial killer responsible for the deaths of 5 men: "It's just horrible"

Police in Stockton, California, are looking for a person who may be responsible for five fatal shootings since July. Investigators believe all five of the shootings are related. 

Paul Yaw, 35, was the first victim. His mother Greta Bogrow told CBS News that he was a good person with a big heart. Learning that his death is possible tied to the other four killings has made things more difficult for Bogrow. 

"He was walking with somebody. And the person turned towards him or faced him, whatever, and shot him multiple times. And now knowing, you know, that this person is out there doing this to multiple people, it's like, it's just horrible," she said.