While ‘EastEnders’ bosses have forbidden the cast and crew from even knowing who killed Lucy Beale, ‘Corrie’ execs let Mark watch Michelle film her final scenes, where he learned who’s responsible for Tina’s death.
Speaking on ‘This Morning’, Michelle said: "I know who the killer is. We did film different endings, but the longer version [we filmed] was who did it.
"I haven't said anything to anyone... Does Mark know? Well he was there when we filmed it.
“But to be fair, he hasn't told anyone, he's been really good!"
“I was thinking of leaving about two years ago, and we spoke about it quite a while ago... and I did think about going a year ago, but I thought I'd do one more year."
Michelle has already revealed her post-'Corrie' plans and is set to unveil her first fashion collection with Lipsy later this year.