"Doomsday!"
Triangle 1993-2. Continued from Superman: The Man of Steel #19 and continues in Justice League America #70.
Doomsday and Superman continue their fight through the streets of Metropolis. After saving Lois and Jimmy Superman heads back into battle but his strength is ebbing and Doomsday is getting the upper hand. Superman must muster all his power as they each throw the blow heard around the world.
Before silence falls, Superman is dead.