Not finding much about the accident other than the boat overturned after hitting rocks and at least 2 others died with Jose. One article said he was a Cuban defector.
Many professional contracts include language that voids the contract if the player engages in certain types of activities that elevate the risk of injury or death. Riding off-road vehicles, piloting an aircraft, and even something as simple as playing sports outside the player's professional training are some of these.
This came into play as players started getting paid enormous salaries under guaranteed contracts.