Ron Lester -- who famously played Billy Bob in "Varsity Blues" -- is hospitalized in critical condition and it doesn't look good ... TMZ Sports has learned.
We've confirmed the 45-year-old actor is hospitalized in Dallas. Multiple people connected to Lester tell us he's been there for roughly 4 months and his health has been in a steady decline.
Lester had revealed he was hospitalized back in November due to liver issues. We're told there was also problems with his kidneys.
He also reached out to TMZ back in January and told us he was having complications with his heart .