out why he shot darren goforth 15 times with no apparent provocation. the harris county sheriff says he was targeted for just being a police officer. >> at this juncture we find no other provocation other than he was wearing a uniform. >> this should be labeled a hate crime. should that be the case? >> if we can demonstrate because he was wearing a uniform, that would qualify. >> the suspect has a rap sheet and history of mental illness. cnn's ed lavandera has more from houston. >> reporter: we have learned in october of 2012, shannon miles was arrested and criminally charged with assault with a deadly weapon in austin, texas. he never went to trial on that charge. instead, he was found mentally