mel speegle. using natural gas this power plant can produce enough energy for about 600,000 homes. generating electricity that's cleaner and reliable, with fewer emissions-- it matters. ♪ >> we found out the murder weapon belonged to mel speegle. >> mel speegle was now the prime suspect. sheriff walt femling ordered his deputies to seal off the perimeter and to stop the nearby house away and almost took this statutory rape charges against him. >> any kind of an arrest whatsoever would have sent bruno back to mexico. that just gave him that much more motive to take care of diane and alan. >> investigators immediately took bruno santos in for questioning. >> i could describe him as a very cocky, arrogant, young man, somewhat confrontational at times, pretty hard to deal with. he told me that he had proposed to sarah or asked her to marry him, which she said yes. >> bruno and his mother claimed bruno was home asleep on the morning of the murders, but no one else could verify his alibi. >> he was coop