No charges were filed because of what the authorities said was insufficient evidence. The singer has been accused in a lawsuit of sexually abusing four women, which he denies.

The Los Angeles County District Attorney’s office confirmed the decade-old investigation in a statement on Friday.

The criminal investigation adds serious weight to accusations that Robinson forced employees into compromising situations involving bathing rituals and inappropriate physical contact. Court documents detail allegations that the Tracks of My Tears singer exploited his position of power over women who depended on their employment for survival.