In June, the creator of the CW series, Roberto Aguirre-Sacasa, revealed that the season four premiere this fall honors the late cast member, who died in March at age 52 after suffering a massive stroke. At Riverdale panel at Comic-Con 2019 on Sunday, it was announced that Doherty, who played Perry's character Dylan McKay's primary love interest Brenda Walsh on Beverly Hills, 90210 in the '90s, would guest star on the episode, which is titled "Chapter Fifty-Eight: In Memoriam."
"I am deeply honored to pay tribute to Luke on Riverdale," Doherty wrote on Instagram, alongside photos of the two. "The care in which this show takes in honoring his memory is beautiful. He is missed. Today. Tomorrow. Forever."