Shannen Doherty's dad, John, passed away from a stroke at age 66 back in 2010, and the actress paid tribute to him on what would have been his 73rd birthday over the weekend. The former Beverly Hills, 90210 actress shared a black-and-white photo collage of her and her dad, writing, "March 25 this beautiful light entered the world and left a lasting impression upon everyone he encountered..... they say we pick our family. I would pick him over and over again. Every time. My hero. My mentor. I'm ridiculously lucky to have had him guiding me, teaching me and loving me. He still is. Daddy I love you. Still. Always. Forever. #adadslove."