Denise Richards has broken her silence on the death of her ex-boyfriend and close friend Patrick Muldoon. "This is so hard for me to put into words. I am deeply heartbroken & devastated losing you. You were my best friend & my family," Richards, 55, wrote via Instagram on Tuesday, April 21. "We met in our first acting class, I was 19 never had an acting job and you were 21 a student at USC doing a recurring role on Who's the Boss." The actress went on to celebrate their friendship, which lasted more than 30 years up until Muldoon's death.