Bourdain suffered with depression for decades, compounded by years of opiate use. Purportedly he had been clean for a lot of years, but that $hit takes its toll. No clue if he was on any meds for his depression, but you have to be in a dark, dark place to leave this world willingly when you've got an 11 year old daughter.
Terrible sad, Tony was a guy that made me laugh a lot, and later in his career, made me think. The world is a little bit lesser without him. RIP Tony.
Caveat...I am a Bourdain fan boy. I've read every one of his books, and seen every episode of his shows from A Cook's Tour, to No Reservations and even his lesser known and short-lived "The Layover." I even forced myself to watch the dreck reality show he was on "The Taste." His books are well worth your time.