The death of Paul Walker shook Hollywood, but no one (so far) more than Walker's 'Fast and Furious' co-star Tyrese Gibson.

Walker passed away in a car crash Saturday afternoon (Nov. 30) in a Porsche Carrera being driven by friend and race car driver Roger Rodas, who also was killed in the one-car collision.

Gibson, flower in hand, arrived at Walker's car crash site, which has since been transformed into a memorial for the fallen actor, and immediately broke down sobbing. Fellow mourners watched in silence as Gibson cried and expressed his own overwhelming grief.

Numerous celebrities, including Walker's co-stars, have expressed their sadness and condolences over the star's untimely passing. Walker is survived by his 15-year-old daughter, Meadow. Our thoughts remain with Walker's loved ones in this unimaginably difficult time.