Josh Barnett
The current #9 ranked heavyweight Josh Barnett is a former UFC champion, though he had that title stripped from him after a positive steroid test.
After leaving the UFC Barnett competed in Pride for many years where PED use was rampant, and upon returning to compete in the US was able to obtain a TRT exemption, but now not even that is available to him.
Barnett’s last fight was a submission loss to Ben Rothwell, and you can expect more results like that for Barnett.