Update: Pedestrian killed in Marin Highway 101 collision during morning commute

SAUSALITO --  A person walking in the southbound lanes of Highway 101 in Sausalito at the Spencer Avenue off-ramp was fatally struck by a vehicle early Tuesday, forcing the California Highway Patrol to shut down three of the four lanes and backing up the morning commute.

The CHP said its dispatch center got calls reporting drivers were being forced to take action to avoid a person wearing a dark hoodie in the roadway.

A short time later, the agency got a call that the pedestrian had been struck around 4:35 a.m.

Investigators said a Dodge Caravan was traveling in the No. 3 lane when the man apparently stepped in front of the vehicle and was struck.  He was declared dead at the scene. The driver stopped and was cooperating with the CHP.

A SigAlert was issued at 5:26 a.m. as 3 southbound lanes heading to the Golden Gate Bridge and into San Francisco were blocked off by the investigation. The Marin County coroner was also dispatched to the scene.

The three lanes reopened at 7:25 a.m.

The fatal collision remains under investigation. The man's identity is being withheld pending notification of next of kin.