By CBS13 Staff

SACRAMENTO (CBS13) — A man has died after a crash off Highway 99 in south Sacramento early Wednesday morning.

The crash happened around 1:15 a.m. near Calvine Road.

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Exactly what led up to the crash is unclear, but California Highway Patrol says the vehicle went off the southbound side of the freeway and ended up overturned in a ditch.

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One man, who authorities say was in his 60s, died from his injuries.

No other injuries were reported.

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Investigators believe speed may have been a factor in the crash.