The accident occurred at 11 p.m. on Friday.
Police say it's unclear how the victim ended up on that freeway.
THe CHP initally got calls about a disabled motorcycle on eastbound Interstate Highway 980, which is a transition roadway located above Highway 24.
"When our units arrived on scene we found a motorcycle. We did not find any occupants near that motorcycle. Several minutes later we got calls of a pedestrian that was possibly struck by vehicles and we responded to the scene here and confirmed that. We have a few vehicles that did stop and we are investigating exactly how this person ended up on the freeway and how many vehicles possibly may have struck the person," Sgt. Bradford said.
Interstate Highway 980 was closed for two hours while the CHP investigated the accident, but it has since re-opened.