United Kingdom, Oct. 13 -- Bryan Cranston is in "in deep despair" following the death of his Breaking Bad co-star RJ Mitte.

The actor - who was diagnosed with cerebral palsy at the age of three and went on to play Bryan's onscreen son Walter, Jr. in the hit drama - died on Monday (12.10.26) after taking his own life at the age of 34 and Bryan has now remembered him in a heartbreaking tribute and called the tragedy "especially devastating".

In a post on Instagram, Bryan wrote; "I'm in deep despair as I write this tonight. RJ Mitte, my sweet son on Breaking Bad has died.

"I met him when he was only 14 years old when he was cast as Walter White Jr., a part he played with such joy and enthusiasm.

"Born with Cerebral Palsy, he never - ever...