Paul Walker's brothers Cody and Caleb at Fast and Furious 7 wrap party: 'Through prayers and determination we got through,' says Tyrese Gibson

The cast and crew of upcoming action film "Fast & Furious 7" celebrated their last day of principal shooting on Saturday, and shared poignant tributes to fallen co-star Paul Walker.

Actor and singer Tyrese Gibson shared photos of the film's wrap parties and expressed bittersweet feelings over the project's completion.

Walker, who played cop-turned-criminal Brian O'Connor, was tragically killed on November 30 when the car he was riding in careened off a road in Valencia, California. The Porsche Carrera GT hit a light pole and two trees while traveling approximately 100 mph before bursting into flames. The driver of the vehicle, Roger Rodas, also died.

Walker's brothers, Cody and Caleb, stepped in to help the producers finish the film because of their striking resemblance to Paul. Producers also used Cody and Caleb's voice for some of Paul's lines.

Gibson shared a photo of himself with director James Wan, Cody, and Caleb Walker on his Instagram page on Sunday, writing: "#Fast7 Wrap Party........ Emotional and bittersweet..... In the end you always got #Family @codyWalker Caleb Walker and Director Great.... James Wan...... "

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The film's completion was an emotional task for the cast and crew, many of whom have been a part of the series since "The Fast and the Furious" was released in 2001. Gibson was thankful that they made it through the difficult shooting.

"Through prayers and determination and moving forward inspired by my heart Paul Walker we got through," he wrote. "The BEST CAST AND CREW IN THE WORLD.... The fans and supporters around the world... We LOVE YOU....."

The R&B singer also honored Walker's 15-year-old daughter, Meadow.

"I wanna dedicate this moment to my niece Meadow Walker.... Uncle Ty loves you..... April 3rd [we're] gonna unleash this magic on the world................ I miss you heart.... I miss you P-Dub!!!!"

"Fast & Furious 7" is slated for an April 3, 2015 release, and is expected to premiere both nationally and internationally on that day.

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