peter van sant has the story. >> on october 12th, 2012, shayna hubers shot her on again/off again boyfriend times. >> 911. >> ma'am, i have ... i killed my boyfriend in self-defense. >> police escorted shayna to the station where for almost three hours the 21 year old told anyone who would listen that she shot 29 year old ryan because she felt her life was in danger. >> -- i picked up the gun and in the middle of hip doing something with his arm or doing something crazy i shot him. >> but prosecutor michelle snodgrass believes that this was cold blooded murder and that the motivating factor was shayna's relentless obsession with the handsome lawyer. >> she wouldn't stop texting him. obsessively texting him. she showed up on an unsolved crime. >> by the fall of 120 authorities believed the swaying had reached a ryan had made plans for the weekend that did not include shayna. >> in her mind, this was a failure of sorts. shayna didn't fail. >> she was moving when she's shots were fired. >> but the defense argues that ryan had a violent temper and shayna's mother sharon hubers says investigator