The collision was reported shortly before 5:30 a.m. near the Chapman Avenue exit, according to a California Highway Patrol log.
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Video from AIR7 HD showed an person's body covered by a sheet on the freeway.
The closure of lanes at the scene led to a traffic backup that stretched for miles on the southbound 55 Freeway. The westbound 91 Freeway was also clogged as the morning rush hour got underway. All lanes reopened by 7:50 a.m.
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The cause of the crash was unknown.