MMC Benefits Handbook
If You Die
Once shares are purchased for you, you own these shares outright and, if you die, they will be payable consistent with the rules applicable to the account in which they were held at the time of your death. See "Can I name a beneficiary for shares held in my Fidelity Investments stock plan account?."
If you die before the end of a quarterly purchase period, your estate will receive a refund of contributions you made to the Plan that quarter, plus interest.