Sarah Michelle Gellar has long flooded her Instagram account with photos of her and her close friend Shannen Doherty goofing off. But on Sunday, her nods to her pal of 30 years took a more somber tone.

On Saturday, Doherty, who was best known for her roles in Charmed and Beverly Hills, 90210, died from stage 4 cancer after living with the disease since 2015. She was 53.

Gellar paid tribute to Doherty by posting numerous snaps of the duo hanging out together through the years on her Instagram stories.