Caroline Day will debut as the Greendale librarian in the May 22 episode.
Penelope previously disapproved of her daughter’s crush, and as a result had hidden the letters.
But by the episode’s end, she handed the letters over to Cheryl.

Caroline Day on ‘Riverdale’.The CW
But now Heather is showing up for real, played by Caroline Day.
Day is set to recur onRiverdaleafter making her debut in the May 22 episode.
According to a character description, “Heather is a librarian in Greendale and Cheryl’s long-rumored junior-high sweetheart.
Riverdaleairs Sundays at 8 p.m. ET/PT on the CW.