Among the stars who showed their respect was Walker's "Fast & Furious" co-stars, Ludacris and Vin Diesel.
"Your humble spirit was felt from the start, wherever you blessed your presence you always left a mark," Ludacris tweeted.
Diesel took to his personal Instagram account and posted a photo of him and Walker next to the caption:
"Brother I will miss you very much. I am absolutely speechless. Heaven has gained a new Angel. Rest in Peace."
Walker, 40, was killed in a single-car accident and explosion near Santa Clarita, Calif. on Saturday afternoon, his rep confirmed.
According to TMZ, the actor was a passenger in the vehicle. The driver reportedly lost control and hit a tree or a pole, which caused the car to burst into flames. The driver was also pronounced dead.
Heavy heavy heart tonight. Paul Walker was a genuinely good, sweet, kind, laid back, loving person. Sending much love to his family.— olivia wilde (@oliviawilde) December 1, 2013
Your humble spirit was felt from the start, wherever you blessed your presence you always left a mark,… http://t.co/nUiPPIU9Bb— Ludacris (@Ludacris) December 1, 2013
I just heard and am in shock. Prayers to Paul Walker's family. Life is precious, never take a day for granted. #RIPPaulWalker— Vanessa Lachey (@VanessaLachey) December 1, 2013
so sad about Paul Walker wish the best for his loved ones— Adam Carolla (@adamcarolla) December 1, 2013
So I'm on a flight and just see that Paul Walker died in a car crash...so very sad! Wow! Stunned— Chris Daughtry (@CHRIS_Daughtry) December 1, 2013
So so sad about Paul Walker : (— Lance Bass (@LanceBass) December 1, 2013
RIP Paul Walker.. Eerie that the star of The Fast & The Furious died in a car accident.. God Bless his daughter— Mario Lopez (@MarioLopezExtra) December 1, 2013
I'm a devastated right now. My prayers & condolences go out to Paul Walkers family & friends. He was a amazing talent & will truly b missed— Kevin Hart (@KevinHart4real) December 1, 2013
All my strength, love & faith to the Walker family during this heartbreaking time. We find our strength.. in his light. Love you brother.— Dwayne Johnson (@TheRock) December 1, 2013
Just heard the horrible news about Paul Walker. So sad & shocked to hear this. :( My heart goes out to his friends & family. #RIPPaulWalker— Paris Hilton (@ParisHilton) December 1, 2013
.@RealPaulWalker May he be in peace. To his family you are in our thoughts and prayers.— Sarah Michelle (@RealSMG) December 1, 2013
.@RealPaulWalker awful news. Paul was a lovely guy. Handsome as all hell and funny and cool to boot. Terrible news. My condolences.— Dominic Monaghan (@DomsWildThings) December 1, 2013
RIP Paul Walker,loved working with you on "Into the Blue". I Will miss you.— Tyson Beckford (@TysonCBeckford) December 1, 2013
Paul Walker. No.— matthew lillard (@MatthewLillard) December 1, 2013
Sick about the tragic loss of #PaulWalker. I enjoyed our time together very much. Such a really nice guy. Prayers to his family and friends.— Carson Daly (@CarsonDaly) December 1, 2013
My Heart is breaking for @RealPaulWalker daughter meadow. Your dad was a stud. So tragic.— eric christian olsen (@ericcolsen) December 1, 2013
Paul Walker was probably the most beautiful American movie actor of the past two decades.— Bret Easton Ellis (@BretEastonEllis) December 1, 2013
Paul Walker???? Oh my god. This is heartbreaking— Kat Dennings (@OfficialKat) December 1, 2013
Heartbreaking!! One of the most genuine & humble people I have EVER met in this industry.. A TERRIBLE loss, be at peace #PaulWalker— Wilmer Valderrama (@WValderrama) December 1, 2013
Paul was a good dude. Conscientious & not caught up in Hollywood. He knew there was more to life & lived like it. Nice to know you brotha.— Ryan Phillippe (@RyanPhillippe) December 1, 2013
I'm not trying to canonize the guy...but wanna know why you RARELY read articles abt Paul Walker or saw him all over tabs? Cus HE HAD CLASS.— kristen johnston (@kjothesmartass) December 1, 2013
I am so beyond heartbroken right now. I can't process anything.— James Wan (@creepypuppet) December 1, 2013
Paul was pure light. I cannot believe he is gone.— Jordana Brewster (@JordanaBrewster) December 1, 2013