'Fast & Furious' actor Tyrese Gibson missing 'best friend' Paul Walker

Actor and singer Tyrese Gibson arrives at the LA Premiere of the "Fast & Furious 6" at the Gibson Amphitheatre on Tuesday, May 21, 2013 in Universal City, Calif. (Dan Steinberg / Invision/AP)

Tyrese Gibson is "finding it hard" to move on with his life since the death of Paul Walker.

The 'Fast & Furious 6' actor is still grieving for his friend and co-star and although he knows Walker - who died in a car accident at the age of just 40 last November - would want him to be happy he's finding it tough to deal with his loss.

Gibson told United Arab Emirates newspaper 7DAYS: "He was one of my best friends ever. I find it hard to enjoy life because he's not here ... but knowing him, he'd want us to keep smiling and having fun."

Gibson also described his late pal as a joyful person who he never saw "sad" or "crying".

Walker and the rest of the cast were on a break from shooting 'Fast & Furious 7' when he was killed in the crash in Santa Clarita, California, on November 30 along with his close friend and the vehicle's driver Roger Rodas.

Walker's passing initially put the future of the action sequel in jeopardy but the film will be released on April 10, 2015, according to the franchise's star Vin Diesel.

Gibson believes Walker - who played Brian O'Conner in the movie series - would have wanted them to finish making the movie and to keep the heist and street racing franchise going.

The 35-year-old singer-and-actor said: "It's a multi-cultural film that has impacted around the world - he would want us to keep doing this on his behalf."