What does George tell candy known all along of mice and men in chapter 5?

In Chapter 5 of "Of Mice and Men", George tells Candy something he's known all along: that Lennie accidentally killed Curley's wife.

This revelation comes after Candy finds Lennie hiding in the barn with Curley's wife's body. George, understanding the severity of the situation, tells Candy that Lennie, in his confusion and strength, had accidentally broken her neck. This realization is a devastating blow for Candy, who had placed all his hopes in the dream of a farm they would share together with Lennie.