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Kathleen's death, he a michael peterson had arranged to meet. >> we were to hook up. >> and what were you all planning on doing? >> having sex. >> reporter: the hookup never happened, but combine that with the other combustibles in the couple's life, the prosecution said, and you have all the ingredients for a fatal confrontation. >> it got out of control, and michael peterson snapped. and he was the only one who could have done it, according to the prosecution. >> reporter: further evidence that michael attacked kathleen ferociously, the prosecution stated, was as clear as the spray of blood ...

>> reporter: a blood pattern expert analyzed the scene. when he completed his initial findings, police suspicions were confirmed. >> he told me that he felt strongly that, um, this was a homicide. >> can you tell us how this has been for you and your family? >> reporter: just a few days before christmas, michael peterson was charged with the murder of his wife. >> they had the grand jury, and, of course, i was indicted. and so, i turned myself in. >> reporter: as the officers booked michael into the county jail, the blended family formed a unified block of support. >> my mother would just be a...

Couple's life, the prosecution said, and you have all the ingredients for a fatal confrontation. >> it got out of control, and michael peterson snapped. and he was the only one who could have done it, according to the prosecution. >> reporter: further evidence that michael attacked kathleen ferociously, the prosecution stated, was as clear as the spray of blood up the staircase walls. >> the amount of blood, the positioning of the blood, the location of the blood, it was overwhelming. >> in general terms, the greater the force, the smaller the drop. >> reporter: to take the jury vividly up the...

Ingredients for a fatal confrontation. >> it got out of control, and michael peterson snapped. and he was the only one who could have done it, according to the prosecution. >> reporter: further evidence that michael attacked kathleen ferociously, the prosecution stated, was as clear as the spray of blood up the staircase walls. >> the amount of blood, the positioning of the blood, the location of the blood, it was overwhelming. >> in general terms, the greater the force, the smaller the drop. >> reporter: to take the jury vividly up the back stairs, the prosecution called the state's blood pat...

Problems. i sensed it. i sensed the stress of that. >> reporter: and when investigators looked at the couple's credit reports they saw just what kathleen's sister candace feared. >> it was living above their means. i mean, you know, if he wasn't writing a book or had any royalties coming in, he had no income. >> reporter: and, according to kathleen's sister, michael's dabble in local politics had brought even more stress to the marriage. when he ran for mayor, he'd been called out publicly if a lie -- a whopper of one. the war action novelist claimed to have been awarded a purple heart, only h...