According to the National Police spokesman in Huíla, Luís Filipe Zilungo, the incident occurred in the locality of Muncolo, where both lived.
The official, quoted by Angop, said that the youngest played with other children, when he threw the stone at the roof, with the grandfather, 45 years old, angry, dealt a blow to the head region with a club.
The youngest, who was seriously injured, was taken to the nearest medical post, but eventually died.
Luís Filipe Zilungo said that the man is already in detention.
