A 42-year-old Brampton man died Wednesday evening, hours after he was zapped with a Taser gun while in a prison cell inside a Peel-region police station.

The province's Special Investigations Unit is investigating the incident. The organization probes police involvement in cases where someone has died or has been injured while in their presence, is investigating.

Sean Reilly, 42, was at the station because he was charged with assault with a weapon. He became unruly while in police custody and the Taser was used to subdue him.

It was the second time Peel police used a Taser in less than a week.

On Friday, they used it on one of their own. Authorities were investigating 35-year-old Const. Jason Ross for impaired driving.

He is facing three counts of assaulting police, one count of assault causing bodily harm, impaired operation of a motor vehicle and mischief.