Windows 7 Product Key(detail2013-06-20 103) trial that a stair fall for a child is rarely fatal - Possible but rare.Windows 7 Product Key That was the conclusion of a bio-mechanical engineer who was commissioned to do a study on whether a child falling downstairs could sustain the type of severe head injuries that led to the death of toddler Samantha Marie Mercer in March 2005. "These data show that it is possible, " said Chris Van Ee, who gave evidence as a bio-mechanical expert in the final day of testimony in the manslaughter trial against Terry Dean Allen. "These data also show that it is rare. " Allen, 28, is accused of causing the fatal injuries sustained by Samantha in her Truro home of March 1, 2005. Because of the massive brain damage she received, the three-year-old was taken off life support two days later at a Halifax hospital. The child also suffered from a fracture to her upper left arm, compression fractures to eight of 12 vertebrae in the middle of her spine, and bruising from head to toe. Allen earlier testified that the girl, who was in his care while her mother Aleisha Mercer was at work, was injured after falling down a flight of 12 stairs. The Crown has accused him of deliberately injuring the girl by slamming her headfirst into her bedroom wall and then using the stairway fall story as a coverup. Allen testified Tuesday that he did not know anything about the dent in the wall, which earlier evidence had indicated had six strands of Samantha's hair embedded in it. Aleisha Mercer, meanwhile, had also testified there was no dent in the wall when she left for work several hours earlier. In 2007, Van Ee of Michigan was hired by former defence lawyer Malcolm Jeffcock to conduct a bio-mechancial study to determine if a stairway fall could cause such head injury. Van Ee testified he conducted three tests: dropping a crash test dummy of the approximate size of Samantha on its head from an eight-foot height; letting it fall down a flight of stairs similar to those in the home; and smashing it headfirst into a wall in battering ram fashion. Van Ee said the results showed that severe head injury could occur from all three examples although in the majority of the stairway testing, serious injury would be less likely.