ONTARIO, CA. NOVEMBER 06, 2014 --- Mourners at the funeral of Pomona SWAT officer Shaun Diamond held

ONTARIO, CA. NOVEMBER 06, 2014 --- Mourners at the funeral of Pomona SWAT officer Shaun Diamond held on November 06, 2014 at Citizens Business Bank Arena in Ontario. Hundreds of law enforcement officials gathered Thursday to honor slain Pomona police SWAT officer Shaun Diamond, who was killed last month while helping to serve a search warrant.
Diamond, 45, was shot Oct. 28 in San Gabriel as he tried to enter the home of David Martinez, a 36-year-old known member of the Mongols motorcycle gang, authorities said. Diamond was part of a SWAT team serving a search warrant.
Authorities say Diamond was standing behind officers as they smashed through the front door of Martinez's home with a battering ram during a search warrant operation, which was part of a larger investigation into the gang.As officers entered the home, Martinez fired a single shotgun round and Diamond was struck in the back of his head. (Photo by Irfan Khan/Los Angeles Times via Getty Images)