1) Became extinct 2) Bombed, theatrically 3) Bought the farm 4) Burned out 5) Cashed in, so to speak 6) Ceased 7) Ceased living 8) Ceased to exist 9) Conked out 10) Croaked 11) Disappeared 12) Faded in the stretch 13) Faded out 14) Failed at stand-up 15) Fell flat 16) Fizzled 17) Fizzled out 18) Flopped as a stand-up Found on https://www.crosswordclues.com/clue/died