Now, Grimes is preparing to marry her real-life fiancé, Brock Powell (via People), … Yandr youtube Sadly, Cassie died in 2005 when she was a young teenager, and now her legacy has been picked up with the story of Mariah, played by the same Camryn Grimes who started her career on 'The Young and the Restless' in 1997, when she was just 7 years old.