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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 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. >> reporter: what's mo...

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. >> reporter: 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 there was if peterson had been standing over his wife, beating her. >> and the individual wearing these pants at time of that impact was in close proximity to the source of blood when it was impacted. >> i remember the jurors were captivated by his tes...

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. >> reporter: 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 there was if peterson had been standing over his wife, beating her. >> and the individual wearing these pants at time of that impact was in close proximity to the source of blood when it was im...

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...