Brittany Murphy's grieving widower, Simon Monjack, has endured three grueling days since the 'Clueless' star's tragic death Sunday. In a tear-filled interview with PEOPLE, a "devastated" Monjack recounts his wife's final days spent sick in bed and denies there were many prescription drugs in the house -- a claim that clashes with newly leaked coroner's notes.

Monjack reveals that his wife, who died of cardiac arrest, suffered from a heart murmur that can cause irregular heartbeats. However, her case was so minor that she did not require medication to treat it. He says Murphy was in bed all day Saturday with a case of laryngitis, taking herbal remedies that would not have accounted for her death.