was killed, riley's grandfather called police about a handgun he owned. >> he calls a report that the gun is stolen. >> that missing gun was a problem for riley, too. he lived with his grandfather. the gun was the same caliber as the one used to kill emma. police didn't think that that was a coincidence. did he express that he knew where the gun? was or, did you deny -- >> he denied. >> after's denials to police, reilly reached out to his close friends, alex and noah. since his breakup with emma, riley had been leaning on them for support. wouldn't he say about how he felt about it? >> he was torn up. throughout this whole time, i tried to spend as much time with him as i could. just to be there for him. >> reilly confided in alex and no, again. he said he would never hurt