Why did Darlene Conner name her son Mark on Roseanne? It was actually a way for her character to honor her late brother-in-law, Mark Healy. And for Roseanne stars Sara Gilbert and Johnny Galecki, it's was similarly a way to honor their late co-star, Glenn Quinn. When Sara was developing the revival of the hit ABC sitcom, she reached out to Johnny when it was time to name their characters' child. "I thought, I've got to reach out to Johnny Galecki because this is our kid together," Sara recounted on The Talk on April 16. "So I texted him, 'What do you think we should name our baby boy?' And then I said, 'Oh, maybe Mark,' because Mark was played by Glenn Quinn, who was his brother on the show [and] who passed away."

Glenn played Mark Healy on the show — the tough-guy love interest of Darlene's sister, Becky Conner, and the brother of Johnny's character, Darlene's ex-husband David Healy. The Irish actor — also known for his role as Doyle in Angel, the spin-off of Buffy the Vampire Slayer — died of a heroin overdose in 2002. He was 32 years old.

Sara also shared a screenshot of her and Johnny's text conversation with her Instagram followers. The Big Bang Theory actor commented on the post, writing, "I don't think we've ever agreed on anything so quickly," and added the hashtag "#ForGlenn."

But that's not the only way the cast honors Glenn, as DJ Conner portrayer Michael Fishman recently revealed on Facebook. "Before each taping, we do cast introductions for the audience," he wrote. "We come out of Roseanne and Dan's master bedroom [and] through the kitchen to meet the crowd. It is an exhilarating, immediate connection with fans. In that hallway, I brought in Glenn's picture, we each pass it before every episode we film. He will always be with us, part of us, part of the Roseanne show and family."

Now that audiences have seen episode 1004, it becomes clear how much Becky and Darlene have grown up. Facing the…

Posted by Michael Fishman on Wednesday, April 11, 2018

"Glenn was an amazing person," Michael added. "He lit up every room he entered and every set he walked on. As a show, we never considered replacing his character… Glenn is irreplaceable."