Don Avery

Don Avery was William Lyons' personal secretary at Lyons Petroluem during Doomsday Clock.

Doomsday Clock
Don asked Elliott Logan, one of the company's private pilot to fly around the Mount Rushmore to please Lyons. To their unawareness, Logan was actually an eco-terrorist working on a suicide mission. At around 8:05am, Logan intentionally crashed the plane to an industrial park nearby, killing all three aboard instantly.