It's hard to believe that it's been 10 years since Heath Ledger's untimely death [1]. On the anniversary of the tragic day, many of Heath's friends and costars shared tributes to the late actor, including actress Naomi Watts [2], who dated Heath from 2002 to 2004.

Naomi took to Instagram and shared her memory of Heath with a black-and-white photo [3] taken by her brother, Ben Watts. The caption reads, "Thinking about this beautiful soul today. 10 years ago he left this world. He was a true original. Heart always on his sleeve, with the most powerful charisma, strength, humor and talent. I will never forget his gentle spirit."

Other actors and friends of Heath sharing their tributes included Lily Cole [4], who starred alongside Heath in his final film, The Imaginarium of Doctor Parnassus, and Busy Philipps [5], who is godmother to Heath's daughter with Michelle Williams [6], Matilda.