Earlier in the season, a body was found at the bottom of a lake on the Carrington property. The dead body turns out to be Roger Grimes, the man with whom Alexis was sleeping when she and Blake divorced. He had been dead for 20 years but the cold temperatures in the lake preserved his body. Dex suspects that Alexis has unresolved feeling for Roger when she vows to prove Blake killed him. Fallon asks Dex what he knows about the man-made lake, and Dex vaguely mentions that it was used to flood an abandoned mine on the property following a failed business deal between the Colby, Carrington, and Dexter families: Colterton Mines. At some point before this season Sam Dexter has died and Dex and Blake later agree never to reveal "the truth about the mine."