The officer is a former Wise County Sheriff's Office deputy. His dad is currently an investigator with the Wise County Attorney's Office. (The news stories should appear here.)
Edit: Dallas Morning News story here. ("He was a good ol' country boy," said Officer David Tilley, a Plano police spokesman. "He had that country accent. You could tell he was from Wise County. Former Wise County patrolman Billy Hamilton, a friend of the younger Hardy, said the news of his death had hit the Decatur-area law enforcement community hard.") Fox 4 News story here.