"The RR diner is dark today. Very sorry to hear Peggy Lipton is gone. We’ve lost a beautiful soul," tweeted Kyle MacLachlan of his former Twin Peaks co-star. Lipton, star of The Mod Squad and Twin Peaks, died Saturday of cancer at age 72. On Instagram, Twin Peaks alum Mädchen Amick wrote: "I lost a sister today. She was a true angel on earth. Always the coolest in the room. You couldn’t fit anymore love into that gorgeous soul of hers and she shared her heart generously with everyone around her. She was such a proud mother. Loved her girls more than anything in the world. I will always love you Peggy. I hope to dance with you again in the stars one day."