here again is keith morrison with "a killing in cottonwood." >> it was evening in cottonwood, california. october 5th, 2012, five months to the day after the murder of karen duenas. her widower mark and their son casey were watching tv. there was a knock at the door. and when mark saw the detectives -- >> he was upset. couldn't believe it. like, are you kidding me? >> they were not. detectives had suspected mark all along, and now they had a warrant for his arrest. mark duenas was charged with first degree murder, held on a million dollars bail to await trial. >> to see him in that situation was surreal. and you hope the system works because there is an innocent man up there having to go through this. >> the whole extended klan, including karen's family, told anybody who would listen that the police made a huge mistake. >> i've never heard them call anybody a name. he just isn't that type of guy. >> i can't think of one time where he raised his voice to anybody. >> that family support was what persuaded an attorney 600 miles away in southern california to take the case. ron powell is his