I've heard about this over the past few days. I haven't read the article, but from what I've heard, he apparently wanted the plane to ditch over the Gulf of Mexico, but it ran out of fuel too soon and crashed on land instead. If it had crashed into the Gulf, not finding a body wouldn't have been a big deal. But because it crashed on land intact and no body was found nearby, they were able to deduce that some shenanigans had occured.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.