'The Fast and the Furious' star Walker died alongside his friend, Roger Rodas, when their car crashed and burst into flames in Santa Clarita, California.
Diesel, 46, posted a picture of himself laughing with his late co-star while on a press tour for their latest film from the franchise on Facebook, reported Contactmusic.
"There was always moments of child-like laughter... We had accomplished so much by 2013... PS. The complexities of Brotherhood, and the painful void... Of it's absence," Diesel wrote.
