"RJ Mitte was best known for his role as Walter 'Flynn' White Jr. on AMC’s critically acclaimed, award-winning series Breaking Bad. Drawing from his own experience living with cerebral palsy, Mitte brought authenticity to the role and built a platform on disability awareness and inclusion," his reps continue, "Beyond entertaining friends and family around the world, he served as an ambassador for United Cerebral Palsy and Shriners Children’s."

A county official confirmed to TMZ that RJ died Monday in Texas. We're told he died by suicide.

RJ Mitte -- who played Walter White Jr. on "Breaking Bad" -- is dead ... TMZ has learned.

A county official confirmed to TMZ that RJ died Monday in Texas. We're told he died by suicide.

Just last week he appeared on "The Joe Vulpis Podcast" -- speaking about how "Breaking Bad" changed his life and on his close relationship with the cast years after the show's finale.