(one's) sun has set
1. One's social, political, or financial success has declined or ended. Even though his sun has set, professionally speaking, the writer still has a large community of dedicated fans. The intangibility of investment-based wealth means many people's suns have set now that the market has crashed.
2. One has died. The artist is so wildly popular that, even after her sun has set, her records will earn her estate millions of dollars for years to come.