Dupras said the babysitter repeatedly changed little portions of her story during various testimonies to better fit her defense each time she took the stand.
In listening to her recorded interview with lead investigator, Mark Diedrich, Martzen said that Van Leeuwen had been active and running around the morning she was hurt; even said the toddler had been talking to her doll when Martzen originally put her down for a nap.
But then during a later testimony, the babysitter claimed that Van Leeuwen was fussy and refused to go to sleep.
Martzen, along with her mother April Roque, who testified Friday, also said that the babysitter had not gotten sick outside CRMC, despite four other witnesses - all friends and family of the Van Leeuwen's - testified that they all had seen her throwing up in a flower bed.
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Dupras also brought up testimonies by several of Van Leeuwen's treating physicians, who said the toddler's injuries were consistent with a massive force trauma, not a short fall.
Likewise, he argued that Van Leeuwen's bruising on her face was caused by a hard, man-made object, not the carpet on Martzen's bedroom floor.
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When asked about her investigation, Ortiz had said the police department was "trying to prove the baby was okay" when she was dropped off at the Martzen's home, and labeled her report as "suspicious child abuse death investigation".
Hammerschimdt also reminded the jury that Martzen was completely cooperative with investigators, who consequently failed to follow up with her claim that she had been on the Internet when the baby fell off her bed.
According to Hammerschmidt, Martzen had no chance to explain what happened due to sloppy, biased police work and a premature decision to declare Van Leeuwen's death a homicide by child abuse before the toddler's autopsy is even completed.
However Van Leeuwen's mother, Deniele, was allowed a second opportunity during her interview with police at the hospital, to explain older bruising on her daughter's face, which the toddler sustained after running into a coffee table the week before.
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Deniele testified Wednesday that she remembered telling law enforcement and doctors at Community Regional Medical Center that her daughter had bumped her head on the family's coffee table the week before.
Her husband Todd also testified Wednesday, saying that he remembered telling authorities that his daughter and son often roughhoused when they played together.
He also said that his kids ran into things like the coffee table sometimes during play.
Two of Deniele's long-time friends testified having been around Van Leeuwen between the mid-morning and early afternoon the day before the fatal incident, and said that the toddler was active, happy, and had an eager appetite.
Todd's sister, Tammy Isaak, also retook the stand and testified that she had stopped by unannounced before the Van Leeuwen children were dropped off at Martzen's for the day, and said that her niece appeared perfectly normal, showing no signs of pain or discomfort.
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Yet while Van Leeuwen's inner cranial pressure was outrageous when she arrived at the hospital, Tawansey said it should not have been that high that quickly after she fell off Martzen's bed.
He testified that amount of pressure would have had to build up over time, at least 12 hours from an addition impact, before her levels could reach the life-threatening pressure the toddler was hitting at Community Regional Medical Center.
However previous testimony by Van Leeuwen's aunt, Tammy Isaak, a registered nurse, revealed that the toddler have been acting perfectly normal before she had been dropped off at Martzen's home, showing no signs of pain or unusual behavior characteristic of recent head trauma.
But her cousin, Rod Harms, also testified earlier in the week for the prosecution, saying that Van Leeuwen had been fussy and had difficulty walking on her own the night before her fatal fall.