Vin Diesel is still suffering from Paul Walker's sudden demise. The actor who has worked with Walker in "Fast & Furious 7" confessed many times it has been very difficult for him to come to terms with Walker's death.

Diesel who recently worked in a film, "Guardians Of The Galaxy," said working to do the fim have been therapeutic for him.

"It was very personal," Diesel, who plays the character of Groot, replied when asked about her getting back to work after Walker's death.

"It was the month after the accident happened with my brother Paul Walker and it was the first time I had worked since. Although it was challenging, just to get back to work was therapeutic- especially as Groot," Entertainmentwise reported.

Diesel added the innocence of his character Groot has helped him to move on from Walker's death.

"There was an innocence about the character that was just refreshing," he explained.

"And it may have been more challenging under other circumstances, but at that time, it was very therapeutic."

Paul Walker died in a tragic car crash in California from a charity event. The production team of the film, "Fast & Furious 7," was shut down after his demise.

The production house said on the movie's official Facebook page that the cast and family of Walker are grieving after his death.

But the shooting was resumed later and Paul's brother Cody and Caleb Walker stepped in to do his remaining scenes. Yesterday Cody was spotted shooting on the beaches of Malibu with Paul's onscreen wife Jordana Brewster. The two were seen shooting a family scene, which looked like Paul Walker's character in the last scene in the film.

"Fast & Furious 7" is set for release in April 2015.