Yes.
My husband's job sometimes involves performing bronchoscopies on deceased patients who are potential organ transplant donors. A cardiothoracic surgeon performs the procedure to see if the condition of the lungs is such that they could be used in a transplant. Last winter they had a case where a body had been submerged in cold water for some time, and although they couldn't resuscitate them, they were able to harvest most of the body organs.
On another note, twice in two weeks he's seen instances of patients who coded, were worked on (ventilated), declared dead, and in both instances, the patient spontaneously started breathing on their own and had good blood pressure readings--90/65. Both were put on ventilators, but they didn't survive.