Retirement accounts are not normally covered by a will. Instead, when you open an account like an IRA or 401(k), you need to designate a beneficiary. This ensures that when you die, any assets in your retirement account will go to the right person.
With the company 401(k), however, your account will automatically pass to your spouse, unless a special waiver form is signed.
Is your beneficiary designation up-to-date?
To review or change your company 401(k) beneficiary, INSERT LINK.