Denise Richards' daughter, Sami Sheen, is sharing an emotional tribute to her mom's late friend and ex-boyfriend, Patrick Muldoon. "Patrick was someone that everyone loved. He was so quick-witted and humble but still made sure everyone knew he was a rock star and never cared what people thought about him," Sami, 22, wrote in an Instagram Story post on Tuesday, April 21. Sami continued, "From day 1 till the last day I saw him, he's never changed. I've been lucky enough to grow up with him and I have yet to live my life without him.