HERCULES, Calif. (KRON) -- A Richmond Police Department detective on their way to work Thursday morning pulled over to help who they thought was a stranded driver on Interstate 80 in Hercules, according to authorities. The encounter ended with the detective fatally shooting the man, setting off a m ulti-agency investigation that shut down the roadway for nearly 10 hours. Prior to the shooting, at 6:35 a.m., the California Highway Patrol began receiving reports of a Nissan car that was being driven on I-80 westbound through Vallejo and was involved in several collisions. The callers told CHP that the vehicle was being driven recklessly and at high speeds, and at one point, it was reported that “the vehicle’s hood had flown up, obstructing the windshield, yet the vehicle continued to travel,” Richmond PD wrote. Forty minutes later, as the Richmond PD detective was driving to work in their unmarked department vehicle on westbound I-80 just west of Highway 4, they came across a gold Nissan car stopped in the fast lane, authorities said. “The detective stopped and activated their emergency lights to render aid to what appeared to be a stranded motorist,” Richmond PD wrote. The detective saw a man standing near the stopped Nissan who was allegedly holding a metal object. While the detective and the man interacted, Richmond police said an altercation occurred and the detective shot the man with their service weapon. The man was transported to a trauma center, where he later succumbed to his gunshot injuries. His identity has not been released as of Friday morning. The detective sustained minor injuries in the incident and was treated at a local hospital, authorities said. "At the time of the incident, the detective was not in uniform and was not wearing a body-worn camera because detectives assigned to investigative divisions are to wear business attire and are not required to wear body-worn cameras,” Richmond PD wrote. Police believe that the Nissan reported earlier in the morning is the same vehicle that the detective encountered on I-80. The California Attorney General’s Office is leading the investigation into the police shooting. All lanes of westbound I-80 were reopened by 5:10 p.m. ...read more read less