HARRIS COUNTY, TEXAS — Texas prosecutors say Shannon J. Miles, the man facing a capital murder charge for the cold-blooded killing of Harris County Deputy Sheriff Darren Goforth, shot the deputy 15 times from behind on Friday. Following a search of the area for trucks matching the one in security video of the shooting, investigators served a warrant to search Miles' house. In his garage, investigators found a .40 caliber handgun with a 14-round magazine loaded with Aguila brand bullets. The gun can hold 15 rounds with one bullet in the gun's chamber, the same number and type of bullets used to kill Deputy Goforth. Ballistics tests later confirmed the gun was the one used to kill the deputy. Prosecutors have not indicated whether Miles owned the gun legally. But even with Shannon J. Miles in custody and being held without bail, prosecutors say they still have no motive for Miles' audacious act of violence. There is no record that he and Deputy Goforth had ever met prior to the attack. Texas law does not require prosecutors to provide a motive to prove guilt. Over the weekend, Harris County Sheriff Ron Hickman said it appeared Miles targeted Goforth purely because he was in police uniform. He then speculated that anti-police rhetoric used by protests for the Black Lives Matter movement could have motivated Miles to kill Deputy Goforth. Black Lives Matter activist and organizer DeRay McKesson, in an interview with CNN, said the Sheriff was politicizing officer Goforth's killing. No evidence has been found to link Shannon J. Miles to the Black Lives Matter movement or its protests. What has been found is Miles' record of past arrests, the most serious of which was a 2012 charge for assault with a deadly weapon following a fight over the TV remote in an Austin homeless shelter where Miles lived. The judge in that case found Miles mentally incompetent to stand trial and sent him to a mental hospital for six months. In 2013 Miles was reassessed and found competent to stand trial, but the homeless man he assaulted could not be located, so the charges were dropped. A capital murder charge for the killing of Deputy Goforth means that if Shannon J. Miles is found guilty, he is eligible for the death penalty in Texas, which since 1982 has executed more people than the next eight states combined. Miles' court-appointed attorneys said their client will plead not guilty. ----------------------------------------­--------------------- Welcome to TomoNews, where we animate the most entertaining news on the internets. Come here for an animated look at viral headlines, US news, celebrity gossip, salacious scandals, dumb criminals and much more! Subscribe now for daily news animations that will knock your socks off. Visit our official website for all the latest, uncensored videos: http://us.tomonews.net Check out our Android app: http://bit.ly/1rddhCj Check out our iOS app: http://bit.ly/1gO3z1f Get top stories delivered to your inbox everyday: http://bit.ly/tomo-newsletter Stay connected with us here: Facebook http://www.facebook.com/TomoNewsUS Twitter @tomonewsus http://www.twitter.com/TomoNewsUS Google+ http://plus.google.com/+TomoNewsUS/ Instagram @tomonewsus http://instagram.com/tomonewsus