Officials are investigating after the second in-custody death of a prison inmate in Metro Vancouver this week.

BC Corrections confirmed that a prisoner at the Fraser Regional Correctional Facility in Maple Ridge died on Saturday.

The prisoner’s identity and cause of death have not yet been released.

The incident marked the second death of an inmate in Metro Vancouver in the last three days.

On Thursday evening, convicted Stanley Cup rioter William Fisher died in custody.

Fisher had been in prison less than a week when he went into medical distress in the North Fraser Pre-Trial Centre, where he was waiting to be transferred to a federal prison.

He was taken to Royal Columbian Hospital, where federal officials technically took him into custody. He died in hospital.

In a statement, BC Corrections extended “sincere condolences” to the family and friends of the inmate who died on Saturday.

“Safety is BC Corrections’ top priority, and we will be conducting a Critical Incident Review to investigate the circumstances, relevant history, and any contributing factors preceding this death,” the statement reads.

An investigation is ongoing.