The severely ill baby whose parents attempted to treat her with cannabis oil has died of natural causes, the B.C. Coroners Service says.

Mary Jane Pierce was born prematurely in April at 25 weeks with serious health problems, including brain bleeding, cerebral palsy and severe seizures.

Justin Pierce and Michelle Arnold had fought to treat her symptoms with cannabis oil. The oil, they said, had helped them with their own epilepsy issues. 

The B.C. Coroners Service said the baby died Friday at B.C. Children's Hospital. 

The parents had won a temporary injunction to keep the infant on life support. At the time, Mary Jane was in the care of an agency under the province's Ministry of Children and Family Development.

The parents dropped their court action to treat their daughter with cannabis oil in September because she appeared to be recovering.

With files from The Canadian Press