PRETORIA, South Africa (AP) — In a day of potentially damaging testimony, a former girlfriend of Oscar Pistorius said at his murder trial Friday that he once shot his gun out of a car sunroof and later cheated on her with the woman he killed last year. And a security guard recalled the athlete telling him everything was “fine” after neighbors reported gunshots coming from Pistorius’ house on the night of her death.

The gripping accounts capped the first week of the televised trial of the double-amputee Olympian, whose chief defense lawyer has tried to sow doubt about the testimony of neighbors who said they heard a woman’s screams before gunshots. Proceedings have also focused on past incidents involving alleged gunplay, part of an apparent prosecution effort to portray Pistorius, 27, as a hothead who sometimes thought he was above authority.