San Diego Police Chief David Nisleit told reporters Monday that losing a police K9 is like losing a family member. "It's gut-wrenching, it really tugs on your heartstrings," said Chief Nisleit. "This is not just a dog, this is a teammate." The chief spoke from the department's K9 training facility in Mount Hope. Sir, a 4½-year-old Belgian Malinois, died in the line of duty last week. He was shot and killed while trying to detain a suspect at Mesa College. MORE: https://www.cbs8.com/article/news/local/sdpd-police-chief-says-department-mourns-loss-of-k9/509-fb5eee9d-fca5-4f4f-b827-d42517750a25