Alan Rickman
Alan Rickman was a favorite actor of audiences young and old through his roles as Professor Snape in the Harry Potter film series. Although throughout the series Professor Snape gave a lot of reasons for the audience not to like him, everyone secretly loved him, telling signs of a great performance.
Rickman seemed to be made for the role and the series would not be the success that it is today without him. In 2015, Rickman was diagnosed with cancer. Sadly, he lost his life to the disease less than a year later.