MY had a lot of crescent shaped wounds on her... I've been trying to figure out what would have made that shape. When they addressed the lifehammer today I about fell out of my chair! My dad gave those to me & my sister when we had to drive from St. Louis to Louisville during some major flooding (yes I'm over 40 and my dad still buys me every life saving safety device on the planet!). I dropped the dang thing on my foot, broke my toe and had a crescent shaped cut on my toe. The PT asked HY if she knew Michelle had given one to JY as well, and she replied yes... but then they dropped it! It would make perfect sense to me that she had one for both her car and his. Hers was found... where is his? IMO it could very well have been used to cause all the injuries detailed in the autopsy report.
Just googled the lifehammer. Yikes! That's pretty amazing.