Way too easy, Pam! Chris Carr's wonderful An Extraordinary Man: Part Two -- Trials and Triumphs .

This one has always been a favorite of mine for the elegance of its "Tempus 'I Love Irony' Award":

Quote
"Lois, he's slipping," Clark whispered, "and I'm getting weaker by the second." His voice cracked and Lois's gaze flew to the white-knuckled hand that Clark held so tightly. The beautiful, poisonous glow of the ring on Lex's finger seemed to pulse and expand, casting a sickly green reflection on the hands of both men.

"Oh, god, Clark, of course you are," Lois breathed. "As long as he's wearing that ring, you'll never regain your strength. If you don't get away from it, you could die."

"Yeah," Clark managed a weak smile, "kind of ironic, isn't it?"

Lois looked at Lex again. He was staring at the ring with dawning comprehension. He began to struggle, vainly trying to bring his body closer to the building, to get a toehold on the slick surface only inches away.

"Don't move, Lex," Clark said sharply. "It makes it harder to - ah, no! - Lex!"

Lex's movement had caused Clark's hand to slide, and the ring now dug into his palm. A piercing pain, stronger than all the rest, shot sharply through his entire body. He jerked upward reflexively in a last desperate attempt to bring Lex closer, but it was not enough. Lex slipped from his grasp soundlessly, dropping and disappearing into the dark long before he reached the concrete 1300 feet below.


Lois: You know the deal.
Clark: Superman gets the guys in capes, Lois and Clark get the guys in suits.

-- Action Comics 827