I have a direct who approached me in March informing me that he wasn't happy and that he would be leaving by June. He is an average to low performer, so I am not focused on trying to keep him on.
Over the last few months he has been winding down in terms of work load and I can't assign him new projects knowing the the knowledge will leave with him, which he understands.
My dilemma is that he is not actively searching for other jobs, he is just in cruise control. This is starting to wear thin on his colleagues and my patience. I have his performance appraisal coming up and was wondering how could I structure it so that he gets the message that it is almost June and he should be on his way?