2 902383 kchen-Sam-Hum-Mal-Law choked on his food in The Dungeons of Doom on level 27 [max 28]. Choked on a fortune cookie. 175 
Virtually indestructible samurai with -23 AC, all natural resistances, magic resistance, invisibility, displacement, reflection, and two amulets of life saving, after completing the Gnomish Mines, Fort Ludios, the Quest, Medusa's Isle, and the Castle, having survived giant eels and black dragons and mind flayers and Ashikaga Takauji and other instant-death nasties, dies by choking on a fortune cookie.
And I did it at the Castle, so you can't even loot my corpse.
Oh, Nethack. I would be swearing profusely if I wasn't laughing so hard.