There is a good article here (worldmag.com): "Shortly after receiving the malpractice money, Mr. Schiavo moved Mrs. Schiavo from the Mediplex rehab facility to Sabal Palms nursing home. There, he added a "Do Not Resuscitate" order to his wife's medical record and in July directed caregivers to withhold from her antibiotics needed to treat a urinary tract infection. He knew, he later said in a deposition, that his wife would likely develop sepsis—poisoning of the bloodstream—and die. Nursing home employees refused to comply, saying such an act would be illegal."
More at link.
It is interesting to note that her feeding tube was removed before but ordered reinstated.