The Cranberries lead singer Dolores O’Riordan has died suddenly at the age of 46. A new source has revealed new information about her cause of death.

According a source in the London Police, The Cranberries lead singer Dolores O’Riordan died of Fentanyl poisoning Monday.

The source added that police department waiting for toxicology report for official announcement.

Here’s The Santa Monica Observer report:

“Lead Singer of the Cranberries Dolores O’Riordan died of Fentanyl poisoning Monday, said a source in the London Police Department. Authorities found counterfeit fentanyl near the 46 years old rocker’s bed.

The source added that an official cause of death will probably have to wait for a toxicology report. He added that suicide and a deliberate overdose are suspected.”

The singer’s friends said she was “dreadfully depressed” in recent weeks, and was also “suffering with a lot of back pain.”