Autopsy Overkill

Can someone please tell me WHY Mary Kennedy is getting an autopsy??  If you find someone with a rope around their neck I think it is pretty clear what the cause of death was.

Donna Summer DEAD

She worked too hard for the money

Newly Orphaned Boyz

The three boyz in the background have lost their father and are looking for a new home.

Winehouse Dead

Who had 27 in the death pool?