They found his body (and it was later flown to Israel:
a Spanish fisherman spotted his naked body floating in the Atlantic Ocean - 15 miles from his boat.
However:
Three pathologists who performed post-mortem examinations failed to agree about the circumstances of his death. One concluded he died of a heart attack, another said he suffered a heart attack and drowned while a third dismissed the heart condition as a cause of death saying Maxwell had fallen into the sea and drowned.
Robert Maxwell was 68, in poor health, weighing 22 stone and with a weak heart and lungs. Shortly before dawn, he left his cabin and went to the rear of the boat. His door was bolted from the outside. He fell forward over a low rail and dangled over the water 10ft below. He clung on with his weaker left arm, tearing the muscles on that side of his body.
(The Independent)