Dr. Isles says that a sliver of wood has two blood stains on it, one AB+ and one O-, one for each of the two known victims. When she pulls their files up on her computer, the both have O- listed as their blood type.
Towards the end, when the young fella was shot in the chest, he would have died instantly. He would not have stayed alive to talk for a little while.
The newspaper headline from 1992 uses the phrase "goes missing" which was not commonly used that long ago. That long ago the headline would have used proper English and would have read, "missing" instead of the ignorant "goes missing."