Only unsolved hijacking in US history. The official FBI stance is that he died while parachuting to the ground. Just as with Alcatraz, where all uncaught escapees are "missing and presumed drowned."
'Underwritten by a "We the People" grant from the National Endowment for the Humanities, The Digital Library on American Slavery is a cooperative venture between the Race and Slavery Petitions Project and the Electronic Resources and Information Technology Department of University Libraries at The University of North Carolina at Greensboro. The Digital Library offers a searchable database of detailed personal information about slaves, slaveholders, and free people of color. Designed as a tool for scholars, historians, teachers, students, genealogists, and interested citizens, the site provides access to information gathered and analyzed over an eighteen-year period from petitions to southern legislatures and country courts filed between 1775 and 1867 in the fifteen slaveholding states in the United States and the District of Columbia.'