SAN DIEGO (FOX 5/KUSI) — A fatal crash involving a motorcycle and sedan prompted a full freeway closure on northbound Interstate 805 near Mission Valley Thursday morning, according to California Highway Patrol.

The collision was first reported in a Sig Alert shortly before 5 a.m. in the area north of Friars Road and south of Murray Ridge Road, with preliminary information indicating that the motorcyclist was traveling at a high rate of speed prior to crash.

In a later update, CHP said a white CFMOTO 450SS and a Ford Explorer were both headed northbound on the freeway when, for reason still under investigation, the motorcyclist rear-ended the SUV.

The rider was ejected during the collision and landed on the roadway. The motorcyclist sustained major injuries and was pronounced dead at the scene, authorities confirmed. Their identity has not been made public at this time.

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All lanes northbound lanes on I-805 were temporarily closed, with CHP reporting “extreme congestion” from El Cajon Boulevard to Murray Ridge Road, where traffic was being diverted.

During the response, motorists were advised to expect delays and consider alternative routes while authorities investigated and worked to clean up the scene.

In an update at 5:55 a.m., Caltrans confirmed the two right lanes of the freeway reopened, while the left three remain closed. As of 8:15 a.m., all lanes reopened to traffic.

The deadly collision is under investigation by CHP’s San Diego Area Office. It’s not yet known if driving under the influence was a factor in the incident.

Anyone with information related to the crash is encouraged to contact investigators at 858-293-6000.

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