When Sawyer killed Locke's father (a murder sort of set up by Locke himself at the behest of Alpert), Sawyer used a chain to strangle the man to death. In this latest ep, Locke is killed by Ben: strangled with an electrical cord. Karma? Writers reusing a brutal way of murder? I don't know.
I do know that O'Quinn ought to get an Emmy nom for his work in this episode. His scene when he was about to kill himself was so well played. Storyline-wise, I wondered why he didn't trust more in Alpert's and Christian's predictions that he would have to die. But acting-wise, the scene was flawless.