A police officer in the town of Caratinga says Joao Maria de Souza
and his wife were sleeping when the one-ton cow fell through the asbestos roof and on top of the victim.
The officer said Souza died of internal bleeding at a nearby hospital. The incident occurred on Wednesday.
He said the cow apparently was grazing on a small hill above Souza's home.
No information was available on the condition of the cow.