Why should anyone be removed from the voter rolls just because you informed a volunteer poll worker at a primary that someone else (not even related to you, with no evidence) died?
What would stop Antifa from looking up the voter rolls and handing out random names of registered Republicans to fellow Antifas, then each one of them gives the poll worker a name to remove?
If you want to remove someone from the rolls, you start with the County Clerk’s office during a non-election time when they’re not swamped with other voting-related concerns. If you are the executor, you can submit a copy of their death certificate along with a written request to remove the person’s name from the voter rolls.