Greg Murphy is a character portrayed by Brady Smith in the ABC crime series Castle. Greg was the fiancé, and is now the husband, of Kyra Blaine in the episode "A Rose for Everafter". His uncle Teddy murdered Sophie Ronson when she wouldn't break up the wedding for him, as he needed to cover up his stealing Greg's family money. Greg is understandably suspicious of Castle, as Kyra's ex, a hostility Castle fully reciprocates for much of the investigation. The novelist does, however, concede to Kyra at the end of the episode that "Greg is a good man".