Works David Foster Wallance, writer, were famous for their obsessively observed detail and emotional nuance. He commited suicide in September 12.Over more than 20 studies suggest that there is an increased rate of having a depressive mental illness in highly creative people.
Experts doesn't necessarily mean that creativity contributes to mental illness and vice versa, but certain types of ruminating personality may contribute to both.
Link: Experts ponder link between creativity, mood disorders - CNN.com