The president of a Prince Edward Island chapter of MADD Canada, Mothers Against Drunk Driving, has resigned after being charged with impaired driving.

David Griffin, 65, is a former deputy chief with Summerside Police and was the volunteer president of the MADD chapter in East Prince County.

He was charged with impaired driving in June.

MADD Canada is a charitable group that works to raise awareness about the dangers of alcohol and drug-impaired driving, and supports the victims and survivors of drunk driving.

Andrew Murie, the CEO of MADD Canada, says Griffin offered to resign as soon as he was charged. He said they had no choice but to accept his resignation.

"Obviously, we're very disappointed, as an organization, that one of our members has been charged with impaired driving," Murie told CTV News from Oakville, Ont.

He added that Griffin was actively involved with the organization for more than three years, and apologized to the group before stepping down.

Murie said he's been CEO of MADD Canada for 18 years and this is the first time he can remember anyone within the group facing an impaired driving charge.

Griffin is scheduled to appear in provincial court in Summerside at the end of August.