Two vehicles that went over the side of Highway 18 in the mountain community of Running Springs on Saturday hours apart were related suicide attempts, one of them successful, the California Highway Patrol has determined.

The drivers were boyfriend and girlfriend, both from Riverside, the CHP said in a news release.

About 9 a.m. Saturday, CHP officers were called to a turnout at the 4,000-foot level for a vehicle that drove off the edge of the highway. An officer said Saturday that the car rolled more than 2,500 down a steep hillside.

Officers learned Jennifer Mae Shipcott, 45, drove her white 2012 GMC Terrain, south on Highway 18 and off the turnout, the news release says.

The vehicle came to rest on a lower portion of the highway. Shipcott was pronounced dead at the scene.

Authorities are investigating the crash as a suicide, the release says.

Later that day, Shipcott’s boyfriend, Paul Albert Chuderski, 42, drove his black 2005 Nissan Titan off the road at the same location where Shipcott crashed, the release says.

The later incident is believed to have been an attempted suicide as well, the CHP said. The release did not provide Chuderski’s current condition.