It isn't the first reference KJ Apa made to Luke Perry's passing on Instagram this week.
Yesterday, Apa shared a screenshot on his Instagram story of the Third Eye Blind song The Background, which pays tribute to a loved one who has died in hospital.
Luke Perry and KJ Apa on Monday, October 8, 2018. Photo / Getty Images
The opening lyrics include: "Everything is quiet since you're not around, and I live in the numbness now, in the background."
Perry played Fred Andrews, the father of Apa's character Archie, in Riverdale, the CW/Netflix TV series based on the beloved Archie comics.
The actor, who shot to fame with his iconic role as Dylan in Beverly Hills 90210, had been in Los Angeles hospital since last Wednesday, where he was in an induced coma.
