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You may be looking for Locke the Echidna from the Mobius Prime universe.
Locke Dies

Locke dies with Knuckles and Lara-Le at his bedside.

Locke the Echidna, in the unaltered version of a possible future reality, was the father of Knuckles, and grandfather of the current Guardian Lara-Su, the latter of whom he never lived to meet. At some point, Locke contracted cancer, which left him in critical condition. Although under treatment from Doctor Shockra, Locke's prognosis was bad, as he was unlikely to live long enough to see Ascension Day. After awakening from surgery, Locke confessed his feelings to Lara-Le and explained to Knuckles the guilt he felt over how he raised him. After this, Locke died peacefully in his sleep on the sixty-first day of 3246, with his son and ex-wife by his side. (StH: #143)

In 3261 when Knuckles visited his father's grave, he revealed he learned that if he prevented his daughter from becoming a Guardian, he would be making the same mistake Locke made with him by not giving her the chance to chose for herself. He then decided he'd let her become a Guardian, at which point the spirit of Locke looked on smiling with Aurora at his side. (StH: #143)

Background Information

  • Locke's fate in the altered version of the timeline remains unknown. It's possible that, as the altered timeline supposedly branches off from that of the Prime Zone circa the events of StH#196, Locke met the same fate as his Prime Zone counterpart.