Authorities diverted vehicles off the freeway near the Magnolia Avenue exit.
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The northbound lanes of the freeway remained closed for about three hours during the investigation. Caltrans said the lanes were reopened shortly after 9 p.m.
A coroner was on the scene because the person who jumped did not survive.
No further information was immediately released.
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Authorities urged drivers to use the 57 Freeway to avoid the congestion.