Casey Kasem Widow -- My Husband is Rotting Because Of His Kid

Casey Kasem is rotting in Norway because of his own flesh and blood -- his daughter -- so claims Casey's widow, who has gone to court so she can put Casey in his place for good.

TMZ first reported ... Casey's remains have been stagnating in Oslo for 3 months, and he's been dead for 5. Kerri filed legal docs recently asking for an order allowing her to bring the body of her father back to the U.S. for an autopsy -- something the LAPD wants for its elder abuse probe targeting Jean.

Now Jean has fired back saying Kerri is the obstructionist that is preventing a proper burial.

Problem is ... Jean's argument makes no sense. She's fighting Kerri on the one hand, saying Kerri's U.S. lawsuit is BS because our courts can't force Norway to do anything, yet on the other hand she seems to be saying Kerri's lawsuit is preventing Casey's burial. She can't have it both ways.

Kerri thinks Jean is full of it and the reason she's dragging her feet is so the body decays to the point the Coroner won't be able to pin the blame on her for the infection that led to his death.