B.C.’s police watchdog and the coroner are looking into why a 58-year-old woman died in the custody of Vancouver Police Department.

The woman was being taken to jail in a police wagon last week when officers noticed she was unresponsive.

She was taken to hospital by paramedics but passed away Tuesday -- eight days after being arrested.

The Independent Investigations Office is probing the death, and will interview the officers involved.

IIO spokesperson Ralph Krenz told CTV Vancouver investigators would review video evidence as part of standard procedure.

“Sometimes it takes time for us to determine whether there is serious harm,” he said.

The cause of the woman’s death is unknown. Her name has not been released.