the man's mother called the sheriff's department after learning her son may have been involved in the shooting. police say that it appears to be an unprovoked execution style killing. >> the witness called 911 and told us that a deputy was shot. multiple units arrive. ems arrived on the scene. unforlt -- unfortunately is deputy passed. >> he is identified as 47-year-old darren go forth. he was married with two children. >> i have been in law enforcement 45 years and i don't recall another incident this cold bloody and cowardly. >> the uniform deputy was refuelling when this man caught on surveillance camera came up behind him and opened fire. >> the deputy then fell to the ground and then he headed over to him and shot him multiple times as he laid on the ground.