A Texas man is in police custody after authorities say he beat his son for eight hours until he died because he would not fall asleep.

Police arrested 34-year-old Alex McGowen Duncan for the fatal beating of his son 6-year-old Tekerrious Jackson after police say he beat the boy for two weeks after he came to stay with him for the summer.

Houston police report that Duncan would force the child to get on his knees and raise his arms above his head before punching him in the chest.

On Friday at around 7 p.m. police believe Duncan saw the boy's eyes flutter in the one-bedroom apartment he shared with his girlfriend 30-year-old Tammyra Sampson and her 11-year-old daughter.

The man reportedly became so enraged that he ordered the boy to raise his hands above his head and punched his chest repeatedly until 3 a.m. Saturday.

Duncan described the punishment to police as “chest boxing” and said his girlfriend only intervened to “show him” how to discipline the child with a belt.
Both Sampson and her daughter witnessed the beating until the boy showed signs of having a seizure, was taken to a hospital and pronounced dead on arrival.

When the father was interviewed by police he told them he beat his son to teach him how to “man up.

Police say Duncan also admitted to beating the 11-year-old girl but said “not as severely” because she was a girl.

The child has been taken into child protective custody while both Sampson and Duncan were arrested.

Sampson has been charged with injury to a child causing serious bodily injury by omission while Duncan has been charged with murder.

Check out coverage on this shocking case from MyFox Houston below.