RJ Mitte, the actor who played Walter White Jr. on “Breaking Bad,” died by suicide at age 34, his representative confirmed to Fox News Digital. Authorities said he died Monday at his home in Brownsville, Texas. The source report said an autopsy was planned; it did not provide a result.

Mitte was diagnosed with cerebral palsy as a child and became an advocate for disability awareness and inclusion. His representative said he served as an ambassador for United Cerebral Palsy and Shriners Children’s, and led The Mitte Foundation, which supports philanthropic and community efforts.

Bryan Cranston, who played Mitte’s father on the AMC series, paid tribute on Instagram, recalling Mitte’s enthusiasm as a young actor and their continuing friendship. Cranston said they had recently discussed meeting for lunch. Aaron Paul, another “Breaking Bad” co-star, also expressed grief in a statement to The Hollywood Reporter and encouraged readers to remember that they are loved and not alone.

Mitte appeared in all five seasons of “Breaking Bad,” portraying Walter White Jr. in 56 episodes. His other television credits included “Switched at Birth,” “The Guardians of Justice,” “Hannah Montana” and “Everybody Hates Chris.”