( CNN ) Former Olympic decathlon champion and reality TV star Bruce Jenner was involved in a fatal four-car accident in Southern California on Saturday , the Los Angeles County Sheriff 's Department said . Jenner was driving a black Cadillac SUV that was the third vehicle involved in a multiple read-end collision , Sgt . Philip Brooks of the sheriff 's department said . The first vehicle was a black Prius that stopped short , CNN affiliate KCAL reported , citing deputies . Behind it was a white Lexus sedan that also hit its brakes . Jenner 's Escalade was towing a trailer with an all-terrain vehicle on it when it ran into the Lexus from behind , Brooks said . The Lexus spun into oncoming traffic and was hit by a Hummer H2 . The driver of the Lexus was killed . KCAL reported Jenner 's SUV left skid marks . The midday wreck came just after noon on Pacific Coast Highway near Corral Canyon Road , the department said in a news release . The sheriff 's department later opened a vehicular manslaughter investigation , a source close to the case told CNN legal analyst Mark Geragos . The investigation will focus on everyone in the case , not just one person , the source said . The sheriff 's department said on its Facebook page that the surviving drivers were cooperating with investigators . A deputy said Jenner voluntarily took a field sobriety test , was questioned and went home . No information about the deceased was immediately available . Jenner , 65 , was not injured in the crash , publicist Alan Nierob said . Pictures posted by TMZ showed Jenner standing by a damaged car talking with a firefighter . Five children and two adults were taken to the hospital with injuries , authorities said . The sheriff 's department is still investigating the cause of the accident , the statement said . The accident occurred on a tricky stretch of the highway , where the road is narrow and twisting . In a bizarre twist to the story , a car later drove through safety barriers around the scene and struck two of the cars from the initial accident , Cmdr . Mike Parker of the sheriff 's department tweeted . The driver was arrested on suspicion of driving under the influence , Parker wrote . Jenner won the 1976 Olympic decathlon with a world record score for the 10-discipline event . He quickly capitalized on his success with Wheaties commercials , appearances and other ventures . He became an actor , appearing in the drama `` CHiPs '' in 1981 and occasionally playing himself on shows such as `` Silver Spoons . '' He is best known to many television viewers as a member of the cast of the current reality show `` Keeping Up With the Kardashians . '' Bruce Jenner 's transition : Even in the age of reality TV , public gender transitions still uncommon . CNN 's Janet DiGiacomo , Rachel Wells , Paul Vercammen , Paul Matadeen , Christie Bear and Vivian Kuo contributed to this report .
Jenner 's SUV hit a car and pushed it into the path of an oncoming Hummer , police say . Driver of the car was killed , sheriff 's deputy tells reporters . Comment: