"Red Glass, Part 2 of 3: Falling Apart"
Triangle 1991-17. Continued from Superman (1987) #56 and continues in Action Comics (1938) #666.
Still confused by what's going on, Superman is seemingly killed by Jimmy and Lex with a massive piece of Kryptonite, only to awaken in a devastated Metropolis and be attacked by J'onn J'onnz and Guy Gardner.