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retired crime scene investor investigator and was a consultant to "dateline. " >> multiple shots fired. shots fired at very close range. >> she has reviewed court records and media reports on this case. we returned with her to the actual apartment where sherri was found murdered to try to understand what happened. police think maybe the killer just walked in the open front door? >> they didn't find any forced entry, so, yes, they are assumg the front door was open and the killer just walked right in. >> right here where we are standing, is there some kind of confrontation? >> yes. this appears to be a struggle here. not just a struggle, but we also have shots fired at this point. we have one shot that clearly goes straight through this back slider and another shot that went through sherri and then back out through the slider also. >> so, sherri is now wounded and she tries to get back downstairs? >> that would be correct. she is bleeding profusely and very wounded and she gets down