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Paul Walker, Vin Diesel

Ralph Orlowski/Getty Images

Several of Paul Walker's Fast & Furious co-stars took to social media on Sunday to pay homage to their friend, who died exactly one year ago.

The actor was killed in a car crash north of Los Angeles on Nov. 30, 2013. He was 40 years old. Walker was survived by teenage daughter, Meadow, his parents, his two sisters and his two brothers.

"A year ago today... a year of mourning... and his absence still leaves me speechless," co-star Vin Diesel said on  Facebook. "We miss you Pablo..."

Many members of the Fast & Furious cast have said in interviews they consider themselves family. Walker and Vin have worked on most of the films in the franchise, including on the first one, The Fast and the Furious, which was released in 2003. Walker's last movie is the upcoming seventh installment, Furious 7.

On Sunday, Vin recalled a moving memory of how he confided in Walker on the day his first child was born and how the actor encouraged him to do something very special.

See the tributes to Walker that he and other Fast & Furious stars posted on the one-year anniversary of the actor's death.

1. Vin Diesel:

He shared with his Facebook followers a photo of Walker with his 6-year-old daughter, Hania Riley.

"He took a certain pride in being uncle Pablo..." Vin said. "After all, we were filming a scene in FF4 the day she was born, and he being the only one I told, encouraged me to go in and cut the umbilicle cord."

Vin Diesel, who has talked about the memory in past interviews, has called Walker his "brother" in past tributes, including one he posted in September on what would have been the actor's 41st birthday

VIDEO: Dwayne Johnson remembers Paul Walker

2. Tyrese:

The Fast & Furious actor and model posted a photo of the two on his Instagram page and a special message.

"A celebration of Paul William Walker will be echoed around the world.... In this life one would hope to be this 'effective...1 year ago today God called an angel home early," he said. "I miss my brother I miss my friend and I miss OUR STAR!!!!! Physically gone but forever alive in our minds, hearts and spirit..."

"What was once tears of pain and shock are now tears of JOY celebrating all that you stood for," he added. "Everyone worldwide please take 5 mins out of your day to send live, prayers and energy to Paul's family his daughter Meadow and immediate circle today will be a tough day for us.... To this day his arm is still around my neck with love and protection..... Rest in heaven...."

Furious 7, Tyrese Gibson, Michelle Rodriguez, Paul Walker, Chris Ludacris Bridges

Scott Garfield/Universal Pictures

3. Ludacris:

He posted a photo of Walker on Instagram and said, "Always in our hearts. Can't believe it's been a year already. You spirit will be felt in volumes across the world forever #fast7april3rd #rip."

4. Michelle Rodriguez:

"I love you Paul," she tweeted, along with a pic of her friend. "Your living in the hearts of all who love you for sure. Sending mad love out to Heaven ."

ROWW stands for  Reach out WorldWide, a foundation Walker founded that aims to help those in need when disasters strike. He launched the group after massive earthquakes devastated Haiti in January 2010.