The 40-year-old Fast & Furious star was a passenger in a friend's car when it spun out of control and burst into flames, killing both Paul and the driver.
When Paul's film franchise co-stars heard they news, they were obviously very upset and many took to Twitter to share their sadness.
Here's what some of them had to say:
Dwayne Johnson: All my strength, love & faith to the Walker family during this heartbreaking time. We find our strength.. in his light. Love you brother.
Ludacris: Your humble spirit was felt from the start, wherever you blessed your presence you always left a mark, we were like brothers & our birthdays are only 1 day apart, now You will forever hold a place in all of our hearts@paulwalker legacy will live on forever. R.I.P.
Vin Diesel: My heart is hurting so sad. Paul walker was a good man. RIP my friend... Sorry to the Walker family. Brother I will miss you very much. I am absolutely speechless. Heaven has gained a new Angel. RIP
Our hearts go out to Paul's friends, family and fans during this extremely difficult time.