Ex-UCLA star and renowned basketball trainer Billy Knight was found dead in Phoenix on Sunday after posting an apparent video suicide note ... cops confirm to TMZ Sports.
The 39-year-old posted a YouTube video early Sunday morning saying it was "probably my last message on Earth" ... and noting, "My time is up."
In the video, an emotional Knight talks about depression and apologizes to friends and family. He also advises people suffering from mental illness to seek help, so they don't end up like him.
Shortly after the video was posted, the Phoenix P.