When Riverdale returns to The CW on October 9, it will be to remember actor Luke Perry, who died unexpectedly during Season 3. The Season 4 premiere, titled "In Memoriam," will feature a tribute to the late actor. During the show's annual panel at San Diego Comic-Con, it was also revealed that Riverdale had enlisted another of Perry's former colleagues, 90210 co-star Shannen Doherty.

Doherty played Brenda Walsh, a love interest of Perry's Dylan McKay, on the series. The two were also close...

Continue Reading SDCC 2019: Riverdale Adds 90210's Shannen Doherty For Luke Perry Memorial Episode