He fell off a Yacht.

> It has been speculated that Maxwell was urinating into the ocean nude at the time, as he often did. He was presumed to have fallen overboard from the vessel, which was cruising off the Canary Islands, southwest Spain.

Let's not turn a perfectly reasonable night time piss into suicide. A person like that doesn't kill themselves over a few bad debts.

It's not considered likely that he killed himself; he died mysteriously on his boat. The inquest ruled that it was probably an accidental drowning.

https://en.wikipedia.org/wiki/Robert_Maxwell#Death