Ronald Douglas, 33, was arrested March 5 on suspicion of raping and sexually assaulting a 40-year-old woman.
During the investigation, authorities found DNA evidence that linked Douglas to a 2015 sexual assault of a 37-year-old woman, also in Norwalk.
In both cases, sheriff's officials said Douglas offered to walk the victim home or give them a ride. That's when Douglas would take the victim to a secondary location and sexually assault them, investigators said.
On March 7, the Los Angeles County District Attorney's Office filed 10 felony counts of sexual assault related crimes against Douglas.
Special victims detectives believe there are more victims and are asking them to contact authorities.
Douglas is being held in lieu of $2 million bail.