De Vries was killed in the crash of a
Cessna 172 in a heavily wooded area outside
Hampton Township, New Jersey, on November 11, 2021, at the age of 49. He was a certified private pilot with an instrument rating. The plane's other occupant, Thomas Fischer, also died in the crash. The cause of the crash was not identified. The
National Transportation Safety Board found no mechanical issue or meteorological reason that could explain it. De Vries was reportedly en route to
Branchville, even though it has no airport. Authorities lost track of the plane during its fatal descent. As a tribute, his initials were added to the
mission patch of Blue Origin's crewed flight
Blue Origin NS-19, which took place on December 11, 2021. In October 2023, his collection of rare luxury watches was auctioned. == Published work ==