The man has been hiding since the shooting in the Santa Coloma de Gramenet arcade near Barcelona on July 1st, according to news agency EFE.
Witnesses reported that the man had spent one or two days at the arcade and had lost great quantities of money playing slot machines, according to Europa Press.
The man reportedly went to the arcade on July 1st and complained about the money he had lost when he suddenly pulled out a gun and shot the manager in the head.
Surveillance camera footage shows that the mad then attempted to commit suicide, but when he didn't succeed he aimed the gun at customers and workers who ran away before he fled the scene, leaving the gun behind.
The wounded manager was taken to the Hospital Vall d'Hebron in Barcelona where he remains in stable but serious condition, according to Europa Press.
The shooter was arrested and taken to court on Wednesday.