Shannen Doherty has recalled how she discovered her husband's infidelity shortly before she underwent surgery to remove a brain tumour.The Charmed star, 52, was married to husband Kurt Iswarienko for 12 years before filing for divorce earlier this year. At the time she cited "irreconcilable differences" as the reason for this. However, on the first episode of her new podcast Let's Be Clear, Shannen opened up about how she discovered that Kurt had been having an affair for two years and that it was this that led to her filing for divorce.