Was it Stacy Keach?
Stacy is actually now a Polish citizen.
Yes. It was Stacy Keach I was thinking of. Thanks! That was driving me crazy.
I just looked it up. I got some of the story wrong. He was convicted of possessing cocaine, not marijuana. He was out on bail in the US, but voluntarily returned to the UK to serve his sentence (six months). I think I got it right now. But maybe not.