A man who set his house on fire then ambushed the first sheriff’s deputy who responded, fatally shooting the deputy and wounding another before he was killed by a police officer who lives nearby, a law enforcement official said. The man’s name and address had been entered into a law enforcement computer system because of previous threats, but the dispatcher entered the address of the neighbor who reported the blaze, so the alert wasn’t activated. 

http://www.nbcnews.com/news/us-news/man-sets-house-fire-kills-florida-deputy-ambush-n254181