Today marks the tragic anniversary of actor Luke Perry's sudden passing. On this day last year, Perry died of a massive stroke at the age of 52. Being that Perry was a beloved co-star of many Hollywood actors, social media has blown up with tributes in honor of the late Perry. Ian Ziering, Perry's co-star on the hit series "Beverly Hills 90210", took to Instagram to remember his dear friend. Ziering paired his tribute with a "throwback" photo of him and Perry.