Man Jumps Off a Plane

I would usually mock this as a first world problem but its rather sad,who throws themself out of  a plane?
What a peculiar painful way to die if one were to kill themself,gosh . 
An unidentified man plummeted 2,000 feet from an airplane Thursday into the waters south of Miami continued Friday morning. Crews from the U.S. Coast Guard and Miami-Dade Police and Fire Rescue searched into the evening Thursday, after the pilot of a Piper PA 46 told air traffic control in Miami that a passenger opened a door and fell from the plane,“Mayday, mayday, mayday,” the pilot said at 1:30 pm Thursday. “I have a door ajar and a passenger that fell down” the air traffic controller responded, “You said you’ve got a passenger that fell out of your plane?” “That’s correct, sir,” said the pilot. “He opened the back door and he just fell out of the plane.”

I hear the search for his body continues, no one is sure yet where the body is and why the man threw himself off the plane or as everyone is calling it 'fell out'
But How do you fall off a plane?
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