US actor Paul Walker gestures to a fan during the premiere of the movie "Fast and Furious 4" in Taipei April 15, 2009. [Photo/Agencies]

'Unsafe speed' caused car crash that killed Paul Walker: sheriff

No drugs, alcohol in 'Fast & Furious' star's fatal crash -coroner

Caleb and Cody Walker will help finish action scenes for their brother and "fill in small gaps left in production," the statement said.

Walker, 40, died on November 30 in a fiery one-car crash in Santa Clarita, California, northwest of Los Angeles.

"Having them on set has made us all feel that Paul is with us, too," the statement said.

Walker was on break from filming "Fast & Furious 7" at the time of his death, which led to a temporary halt in production.

The actor had become an emblem of street racing and car culture in the role of law enforcement officer Brian O'Conner in five of the six "Fast & Furious" films about illegal street racing, heists and organized crime.

Universal Pictures, which is owned by Comcast, subsequently pushed back the release of the seventh installment of the highly lucrative franchise by nine months to April 2015.

Walker's penultimate film role was in "Brick Mansions," which will be released in US theaters on April 25.