Alex Kingston feared she'd made the 'the biggest mistake' of her life by joining ER Actress Alex Kingston feared she'd made the "the biggest mistake" of her life by joining ER because she "wasn't particularly happy" living in Los Angeles. 22 April 2026 Alex Kingston feared she'd made the "the biggest mistake" of her life by joining ER. Alex Kingston has opened up about ER The 63-year-old actress shot fame in 1997 when she was cast in the hit medical drama as Dr.