Denise Richards is saying goodbye to her dear pal and ex-boyfriend, Patrick Muldoon. As we previously reported, the 57-year-old actor died over the weekend after suffering a heart attack. Those who knew and loved him have been taking to social media to mourn the sudden loss, including Denise. They began dating in 1998 - a year after filming Starship Troopers. They were on-and-off for two years before breaking up for good in 2000.