Pretending for a moment that a picture of sheila on the bed with 1 bullet wound does exist,
The photo of Sheila with one bullet hole has never been used as evidence, it doesn't have an evidence number, it doesn't have a coallition number with other photo's from the scene, there isn't a photo missing that remains unaccounted for from the polices stand point.
So even if Mike produced the picture right now - nothing would happen. It would be deemed as fake. It's 2012, the brilliance that computers can do can't be ignored.