I generally agree with this. Although I'll add that it may not even have been his original intention.Not that it matters but I'll take option #1, in honor of Mr Occam. By age 26yo, he had a criminal history.
At this stage, I'm inclined to believe KM became highly intoxicated, on purpose and with intent, in order to end his life by throwing his drunken body into the water.
It is significant that his ship pass was used to open the door to his cabin. But, did he enter the room? Did he prop the door open for whatever reason, to grab something, or to leave something? When the door closed, he was in the hallway and not in his room. jmo
Suicide is the tenth leading cause of death in the U.S. One person dies by suicide about every 11 minutes. It is the second leading cause of death among people ages 10 to 34
A recent life crisis and problems with money or legal problems can be contributors.
Returning to port in Miami, he may have become despondent over his personal situation, leading to heavy drinking. And once he became extremely intoxicated, anything could have happened. There's a well-established link between inebriation and drownings aboard cruise ships.
One thing I'd like to know is how much alcohol he consumed that final night.