Taking to Instagram, Ulrich posted a picture of himself dressed as FP.
The caption read: “Goodbye Riverdale…thank you for introducing me to some lifelong friendships and so many beautiful souls.
“Today is my last day on set but the experience will never leave my heart. “Thank you to all of you for the love and support.”
This prompted some of his co-stars to comment including Cheryl Blossom actress Madelaine Petsch who said: “I love you”, followed by a broken heart emoji.
Hermione Lodge actress Marisol Nichols, who will also be leaving in series five, said: “Love you Skeet. Can’t wait for the world to see you’re [sic] upcoming projects.”