Trouble removing/re-adding z-wave switch

I had a reasonably stable z-wave network running, but a power outage seems to have knocked a few of my switches offline. One of them, a Leviton DZS15-1LZ Switch became unresponsive. After attempting to heal the node, the network, restart the network to no avail, I tried removing the node, but it wouldn’t disappear from the z-wave node list. I then reset the switch. It was added to the network, but with the same node number. So I now have duplicate nodes (one functional, the other not) with two entities attached to either node (again, one functional and one not). Any tips for deleting the duplicate node?