Atlanta ? A 45-year-old man died of an apparent heart attack after riding the newest roller coaster at Six Flags Over Georgia amusement park, officials said.

The man was alert while riding the Goliath roller coaster Thursday, but he was unconscious by the end of the ride, Six Flags spokeswoman Christy Poore said.

When firefighters arrived, he wasn’t breathing, said Cobb County Fire Lt. Dan Dupree. He said the man was pronounced dead at a hospital.

An autopsy showed Michael Corry of Birmingham, Ala., had a congenital heart problem, according to the Medical Examiner’s Office.