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Tyrese Gibson was overcome with grief Sunday afternoon when he showed up to the crash site where his "Fast and Furious" co-star Paul Walker died less than 24 hours before.

Tyrese paid tribute to Walker during a quick stop at the Santa Clarita crash spot moments ago ... the same place fans are leaving tons of flowers and various tokens in honor of Walker.

Gibson is clearly falling apart while visiting the death site ... and everyone around him is completely silent while he mourns.

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3:00 PM PST -- Tyrese took a piece of the crash wreckage home with him and posted a pic of it online afterward.

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