“Breaking Bad” actor RJ Mitte has died at 34 in Texas, and castmates led by Bryan Cranston have poured out grief for the young star they called family.

Mitte, who played Walter “Flynn” White Jr. on the AMC drama, died Monday. A county official confirmed the death in Texas and said a death investigation is still underway.

Just The News reported he was declared dead at what is believed to be his home in Brownsville, Texas. TMZ was first with the news, and outlets later carried the cast’s public mourning.

His representative confirmed the loss in a statement that described Mitte as far more than a TV son on a hit show.

Page Six published the representative’s words on the actor’s passing and his public work.

"It is with profound sadness that we share the tragic passing of beloved actor, philanthropist and passionate disability rights advocate RJ Mitte,"

The same statement noted that Mitte drew on his own life with cerebral palsy to play Flynn with authenticity, then used that platform for disability awareness and inclusion.

Cranston says he is in “deep despair”

Bryan Cranston, who played Walter White and served as Mitte’s TV father, posted on Instagram Monday evening. He shared a younger photo of the two of them and wrote that the loss hit him hard.

"I’m in deep despair as I draft this tonight. RJ Mitte, my sweet son on Breaking Bad has died,"

Cranston said he met Mitte at 14, when the teenager was cast as Walter White Jr. He wrote that Mitte never used cerebral palsy as an excuse and met a tough shooting schedule with determination. The pilot began filming in February 2007, when Cranston said the young actor was still “pretty raw,” then grew into a fine performer over the years.

He also recalled that Mitte took advice from his TV parents, Cranston and Anna Gunn, while still sometimes ignoring it “to learn the hard way,” like any teenager. After the show, Cranston said, Mitte became a vocal advocate for performers with disabilities and headed a philanthropic effort focused on the disabled community.

They had been texting only weeks earlier about a lunch date. Cranston asked why this happened and said he did not know whether that lunch would have changed anything. He did know he loved Mitte and enjoyed their years together on the series. He also shared a suicide hotline number with his post.

Co-stars remember a “sweetheart” on set

Aaron Paul, who played Jesse Pinkman, released a statement obtained by The Hollywood Reporter. He spoke directly to fans who might be struggling as well as to his friend.

"I am at a loss. I am heartbroken over this news. RJ, I love you my friend. You will be missed. And to whoever happens to be reading this, please know you are loved, and you are not alone. Always remember that."

Dean Norris, who played Hank Schrader, posted on X that he always looked out for Mitte as a young kid on set even though Mitte did not play his TV son.

"Though RJ didn’t play my TV son, I always looked out for him as a young kid on set. He was a sweetheart of a young man and will be greatly missed,"

Norris added that the news was heartbreaking and that he was thinking of Mitte and his family. Luis Moncada and Daniel Moncada, the twins who played the Salamanca cousins, each posted Instagram tributes and referred to Mitte as their “lil brother.” Krysten Ritter, who played Jane Margolis, called the news beyond heartbreaking on Instagram Stories, reposted Cranston’s tribute, and said her heart was with Mitte’s family and loved ones.

Disability work and an open investigation

Breitbart reported the Brownsville, Texas, death and noted TMZ’s account that a county official said Mitte died by suicide while the investigation continued. That same coverage highlighted his disability-rights work and roles as an ambassador tied to United Cerebral Palsy and Shriners Children’s.

Fox News also confirmed the death through Mitte’s representative, carried the same profound-sadness statement, and reported that a cause was not immediately disclosed in its account, an early gap that left official manner-of-death details still tied to the open Texas investigation.

What is not in dispute is the record Mitte built after being cast as a kid with cerebral palsy on one of television’s biggest dramas. He turned screen time into advocacy, kept working, and stayed close enough to his old cast that lunch plans and on-set memories were still fresh when the tributes began.

Fame, steady work, and a circle of famous friends do not cancel private pain. The people who watched RJ Mitte grow up on camera are left with gratitude for his grit, and with the hard fact that success is no substitute for the help someone may need before it is too late.