Greg Sumner leaves Knots Landing near the end of the series, and the character’s last seen date is May 9, 1997.

Quick Scoop

  • Greg is a late-run character, so he doesn’t exit early in the show’s history.
  • Knots Landing itself ran for 14 seasons from 1979 to 1993, with later references and cast retrospectives still discussing the series afterward.

Context

Greg Sumner is played by William Devane, and fan wikis list his “last seen” appearance as Back to the Cul-de-Sac on May 9, 1997.

That means his departure is tied to the show’s later continuation material rather than the original CBS run ending in 1993.

What this means

If you were asking about the original televised series, Greg is still part of the show through the end of its main run.

If you meant the very last on-screen appearance in the broader Knots Landing timeline, it’s that 1997 appearance date.