New YorK: Vin Diesel has told how working on the Guardians Of The Galaxy movie helped him through his grief over the death of Paul Walker. Paul died in a car crash last November in the middle of filming Fast And Furious 7. He and Vin had worked together since the first Fast And Furious movie in 2001. Vin, who voices tree-like creature Groot in the Marvel comic book movie, took part in a question-and-answer session on Facebook to mark the unveiling of the film’s first full trailer. Asked about getting into character as Groot he said: ‘It was very personal.–BEL