Shannen Doherty will guest star in Riverdale's tribute episode for Luke Perry. 1 / 7
Doherty and Perry met on Beverly Hills, 90210, and remained friends ever since. 2 / 7
The actor passed away earlier this year at the age of 52. 3 / 7
Showrunner Roberto Aguirre-Sacasa stated that Perry had wanted Doherty on Riverdale since season 1. 4 / 7
Doherty immediately said yes when offered the role. 5 / 7
Perry's tribute episode will be the series' season 4 premiere. 6 / 7
Riverdale returns to the CW for its fourth season on October 9, 2019. 7 / 7