https://www.cracked.com/article_48362_its-always-sunny-in-philadelphia-fans-are-angry-that-lynne-marie-stewart-was-omitted-from-the-emmys-in-memoriam-segment.html

Stewart, who played Miss Yvonne on Pee-wee’s Playhouse and recurred as Charlie's mom Bonnie Kelly on It's Always Sunny, didn't make the In Memoriam cut after her death in February at age 78.