It's since been revealed that Martin and Stacey - who were in several scenes during the live episode, culminating in his death - had "code names" in the script in an apparent effort to keep their identities under wraps.
Reflecting on the episode, Kellie - who included other photos in the post - wrote in part of her caption: "I have to give some special love and respect to @laceyturner and @jimmybye who gave the most beautiful and heartbreaking performances last night.
The BBC show killed off the character - played by James Bye since 2014 - on last night's live episode, as part of its 40th anniversary celebrations this week.
Kellie suggested in the caption that the two characters had been named Todd and Winnie in the script for the recent live episode.
The episode showed the aftermath of Martin - who first appeared on EastEnders in 1985, the year that it began - being crushed by a metal beam inside the pub.
