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primarks on michelle's office door and said they were a crucial clue that helped explain the murder. >> our belief has always been that david dooley was in the middle of breaking into her office when she came up the stairs and surprised him, and ultimately she was assaulted and restrained. >> because she was a witness to a crime in progress? >> absolutely. >> the medical examiner said michelle was bludgeoned with something similar to an industrial packing tape gun. but why wasn't any blood evidence found on david dooley. and why wasn't any of the dna found at the scene a match to his. the prosecutor argued the janitor worked every day with cleaning supplies and plastic bags. together perfect for removing evidence of a crime. >> at the time david dooley attacked michelle in that hallway, what did he have with him? a rolling crime scene cleanup parked with a trash bag in the middle of it. >> it is my personal belief that when he left that blowing he took with him a bag containing all of the evidence that was missing from the scene