BATON ROUGE, La. (AP) — Days before his own death, Louisiana Master Trooper Chris Hollingsworth walked into a secure room deep inside state police headquarters, swore an oath and told investigators about the night he held down Black motorist Ronald Greene and repeatedly bashed him in the head with a flashlight.

Gone was the bravado from Hollingsworth's earlier boast — captured on body-camera video — that he "beat the ever-living f-—" out of the man before his 2019 death along a rural roadside in northeast Louisiana.

Instead, in a two-hour interrogation, Hollingsworth meekly portrayed himself a...