duenas back yard. and as for those screams heard by teenagers a couple of blocks away -- >> the entire block where mark lives hears nothing. the woman next door sleeps with her window open, hears nothing. the person on the other side of the house is jason duenas, who has his window open. he hears nothing. >> reporter: the defense put on a witness who said karen told her the week of the murder that she and mark were making plan for a bright future together. the idea that mark would kill karen so he could pursue a happily married woman from idaho he hadn't seen in more than 30 years was simply ridiculous, said the defense. >> it sounds like a great motive when you look at it from a distance. when you get to it, it sounds like puppy love. >> reporter: the defense rested its case in a matter of hours. when it went to the jury, how did you feel about it? >> i was pretty confident. you could see in the jury's face that they weren't buying this. >> reporter: and something odd happened. the day the jury went out, a female juror overslept. rather than delay the case, the judge replaced her with an alternate. an