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Those stairs. >> right, how long she'd been -- actually been there. >> 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 fa...

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 up the staircase walls. >> the ...

The back stairs, the prosecution called the state's blood pattern expert, duane deaver. he told the jury with certainty that kathleen peterson had been beaten to death. he testified the droplet pattern high up the walls was just what you'd expect to see with a weapon rising, striking, and casting off blood with each new blow. >> and i believe there is a minimum of four blows that have occurred in this, uh -- in this scene. >> what's more, deaver testified, this blood stain was found on the inside of peterson's shorts. he'd done tests that he says proved that the only way it could have gotten t...

Michael peterson's conviction was tossed out. his family was overwhelmed. >> i was sweeping with joy and shock and could not believe that there was hope. >> i was like,my dad's getting out. we're going to have our dad back. >> for the peterson children, now there was only joy. >> lots of hugs, lots of happy photographs. we're all like jumping up into the air in this silly picture, just so happy. >> 24 hours after the judge issued his decision sharply criticizing the blood pattern expert's work on the case, michael peterson was released on bond.

The victim actually goes down those stairs. >> right, how long she'd been -- actually been there. >> 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? >> 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. >> as the officers booked michael into the county jail, the blended fa...