From LaurieJ's article and link :tyou:
According to officials, McCarthy, being represented by attorney Jonathan Shapiro, punched Bella in the stomach repeatedly sometime in May and put her in a refrigerator for a few days while he and Bellas mother used heroin. However, investigators have not yet given a cause of death.
There is speculation she may have been suffocated before being punched. McCarthy and Bond then allegedly put Bella in a duffle bag and dumped her in Boston Harbor. Bella floated to Deer Island where she was found.
McCarthy, who claimed he killed Bella because she was possessed, was arrested at Beth Israel Hospital where he was being treated for an abcess.
http://www.winthroptranscript.com/2...but-winthrop-will-be-her-final-resting-place/
He punched Bella after he suffocated her? And MM is now admitting he killed Bella?
I don't know if we will ever know what this little angel endured at the hands of these two subhumans' hands.