The RCMP Major Crimes Unit is investigating after a 50-year-old man died while in police custody on Friday.

Officials say the suspect was arrested by Airdrie RCMP following an unspecified incident at CrossIron Mills Mall at 8 p.m. on May 24.

While he was in custody, the man died of unknown circumstances.

"I can confirm that we attended the RCMP detachment in Airdrie and determined one adult male deceased. No transports to hospital from that location," said Calgary EMS spokesperson Adam Loria in an email to CTV News.

The victim's family has been notified, but his identity is not being released.

The investigation is ongoing.