Our local club maintains two repeaters. One of our members has floated the idea of changing one of the repeater id's to that of a founding club member who passed away a few years ago. His callsign is still listed as active and does not expire until 2019. My question is this: is it possible or even legal to use the call of a deceased amateur for repeater identification? If so, is there a registration process that is required by the FCC or any other agency to designate the call for such a use. We do not want to adopt the deceased member's call as a club callsign.