Johannesburg - The trial of the man dubbed the “Modimolle monster” continues in the Pretoria High Court on Friday.
Johan Kotze is accused of orchestrating the gang rape of his former wife Ina Bonnette, and murdering his stepson Conrad, 19, in his rented home in Modimolle on January 3.
Andries Sithole, Pieta Mohlane and Frans Mphaka are also accused of kidnapping, assaulting, repeatedly raping, and attempting to murder Bonnette that day.
On Thursday, Kotze told the court the adultery of his wife was treasonous.
He was responding to a question by prosecutor Retha Meintjes.
She asked about his emotions on the night he found out about his then-wife's infidelity.
He went to a dance on New Year's Eve 2011 and saw her lovingly interact with another man.
Kotze said he had many questions about her fidelity during their marriage and observing what he saw on New Year's Eve explained a lot to him.
Earlier, Kotze told the court he could not remember mutilating Bonnette's breasts and genitals. - Sapa