Hober Mallow wrote:
Gene Roddenberry was very much alive during the production Unification, which makes the Mark Leonard story complete hogwash. Roddenberry died during the filming "Hero Worship."
Roddenberry died during filming of Hero Worship
was 5x07-08. But I don't know the production orders of those two episodes.
ETA: Unification was produced before Hero Worship but had the Gene Roddenberry memorial title card when it aired.