"In addition, the autopsy found no traces of morphine in her system at her death, although she had been given two doses in the days before she died. The Schindlers had contended that morphine might have been used to speed their daughter's death."
That strikes me as a little odd. If she were properly examined, why didn't they see ANY trace of morphine?
Do you remember that Cindy Shook (Michael's x girlfriend) said in an interview that during a fight with Michael that he said he'd rather be laying with Terri in the nursing home/hospice than with her?
Roll that one around in your mind a bit and see what you come up with.