Byrnerobotics.com features a post by a longtime friend of John Byrne, Cory Vandernet, who found a list planned storylines through Uncanny X-Men #150. One story was the death of Wolverine's love, Mariko, after a vicious attack at the hands of Sabretooth.
Finally, he can take it no longer. He begs Jean and Xavier to do something, to save her. Xavier scans her and makes a sad discovery. She is brain dead. Only the machines are keeping her alive. Wolverine refuses to believe it. But Jean links his mind to Mariko, and he feels the emptiness where her soul used to be. He asks to be left alone with her. Xavier and Jean depart, to wait outside. Wolverine sits by Mariko's beside, holding her hand, stroking her hair. He rises. He looks at the machines that are maintaining her life functions. In a sudden, swift movement he pops his claws and slashes the power cables. The machines fizzle and shut down. Outside, in the hall, Jean and X have both "felt" what has happened. They move toward the door, but Wolverine comes out before they can enter. He stands for a moment in silence, looking at them. Finally he speaks. "She ain't meat," he says softly. And in an instant, he is gone, disappearing down a stairway.
Next issue, he finds and, in the most horrifying battle the Code would allow, kills Sabretooth (who was, at this point, to be revealed as his father.)
Regarding the above image, Cory writes: