Confirming something most of us already knew.

LOS ANGELES - A memorabilia dealer who profited from O.J. Simpson for many years is the latest former crony to write a tell-all book, this one alleging a groggy Simpson, high on marijuana, confessed to killing his ex-wife after he was acquitted. . . .

He said Simpson had smoked pot, took a sleeping pill and was drinking beer when he confided at his Brentwood home weeks after his trial what happened the night of June 12, 1994. Simpson said he went to his ex-wife’s condominium, but did not bring a knife with him. Simpson told him Nicole Brown Simpson had one in her hand when she opened the door.

In a soft mumble, Simpson told him: “If she hadn’t opened that door with a knife in her hand ... she’d still be alive.”

“Nothing more needed to be said,” Gilbert writes. “O.J. had confessed to me. There’s no doubt in my mind.”

A sketchy source, to be sure, but then what intellectually honest person still doubts OJ’s guilt?