London police source says Dolores O'Riordan died of fentanyl poisoning

Lead singer of The Cranberries, Dolores O'Riordan, died of fentanyl poisoning on Monday, source in the London Police Department said.

Authorities found counterfeit fentanyl near the 46-year-old's rocker's bed, a source told the Santa Monica Observer. The source added that no official cause of death has been declared yet, saying that an official cause of death will be announced later with the toxicology report.