On each server in your network you should remove the server from all replica rings. Make sure that you have designated a master for each replica.
From TID 3338221:
4. Verify that each replica ring is consistent and valid:
Load DSREPAIR -a | Advanced Options | Replica and Partition Operations | (select each replica one at a time ) | View Replica Ring. If the suspect server exists in the replica ring, select it and press enter, a screen will appear entitled Replica Options: Server . Select the option entitled "Remove this Server from the Replica Ring". This will remove the suspect/crashed server from the replica ring for this partition. This information will synchronize out to the other servers in the replica ring.
This step needs to be completed for each replica that the suspect/crashed server contained.
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