Police have not released the name of the victim, pending notification of next of kin.
An arrest affidavit said Myers, the victim and another man were drinking alcohol and watching football Sunday night at a home in the 2800 block of Cantabrian Drive in Killeen when the victim got the hiccups.
To make the victim's hiccups go away, Myers produced a handgun and pointed it at the man's head in order to scare him.
Believing the gun to be loaded with dummy rounds, Myers then fired. A bullet struck the victim in his eye.
Police received a call for the shooting at 10:04 p.m. When emergency personnel arrived, they found the victim bleeding profusely.
Emergency responders took him to Skylark Field, where he was to be airlifted to Scott & White Hospital in Temple; however, the man died en route. Justice of the Peace Garland Potvin pronounced him dead at 11:04 p.m.
Myers admitted shooting the victim, telling police it was an accident.
Sunday's incident marked the second accidental shooting in Killeen in 2012.
Jordan Kenneth Jones, 3, died Feb. 21 after his 4-year-old brother shot him.
The child had been playing with a loaded handgun left on top of a dresser.