Alex Murdaugh's two life sentences in prison are going by in a flash, and by that ... we mean the flash of a camera, 'cause the guy's apparently taking pictures of himself in the clink. The convicted murderer -- who was found guilty of killing of his wife and son earlier this year -- has had selfies he's taken from inside his prison cell leaked to the public ... and they're quite something to look at, especially since a handful of them feature AM shirtless.