CHARLESTON, W.Va. (AP) -- The parents of a man who killed two West Virginia State Police troopers say their son struggled with drug abuse for years.

Darrell Baber and Diana Baber of Oak Hill tell WOWK-TV (http://bit.ly/Q3S4Kb ) that they are heartbroken and sorry for their 22-year-old son Luke's actions.

State Police say Luke Baber fatally shot Cpl. Marshall Bailey and Trooper Eric Workman Aug. 28 during a traffic stop near the Wallback exit of Interstate 79 in Roane County. Luke Baber also shot and wounded a Roane County deputy and a tow truck driver before he was killed in a shootout with other officers.

His parents say the police officers aren't responsible for his death. They say drug abuse killed their son.

They also say the shootings were "mindless and calloused."