There is a tax advantage, and my understanding is that his heirs would a collect more if he died prior to retirement. Now, that could just as easily point to suicide.
As for contacts, the addresses of PA retirees, unless subject to a protection order, are public. There is also the "ex-DA" possibility. He may have been called in numerous cases after he retired; certainly, at least one ADA was called in the Sandusky investigation. I would also have no doubt that he would have been hounded by the Press.
I would also note that RFG did have an interest in the 1985 case of Hinckley, OH police chief, Mel Wiley, who the police determined left voluntarily.
Sorry but I don't think your theory holds water. One walks away from a cushy retirement so his/her child can get a tax advantage from his/her retirement? I don't know anyone who leaves their retirement for their child. Anyone. Ever.