Sue Vaughn is a character portrayed by Jennifer Riker in the ABC crime series Castle. Sue Vaughn is the wedding co-ordinator whom Beckett and Castle meet on their first visit to the palatial Finnegan residence in "Fool Me Once…". Sue, it turns out, was providing logistical and emotional support to her friend, Elise Finnegan, in the build-up to her wedding to Steven Lambert, the love of her life.