Sian Reese-Williams is a Welsh actress. She began her acting career in the late 2000s, debuting as Gennie Walker in the British soap opera Emmerdale. She starred on the said TV show from 2008 to 2013. She also appeared as herself in an episode of Loose Women. After Emmerdale, she starred as Manon in the Welsh-language show Hinterland. The actress later starred as Trudy Franken in the TV drama Requiem. As of 2018, she stars as DI Cadi John in Craith / Hidden. Recently, she appeared as Sgt. Jane Cafferty in a few episodes of Line of Duty. Just this year, she made her film debut in Justine.