Oscar Pistorius (r) speaks with a member of his defense team Oscar Pistorius (r) speaks with a member of his defense team

Oscar Pistorius was not suffering from mental illness when he killed his girlfriend, a panel of mental health experts determined, according to The Associated Press.

The murder trial for Pistorius had taken a one-month break for the 27-year-old Paralympics champion's mental state to be assessed. The reports conclude that Pistorius was "capable of appreciating the wrongfulness of his act" when it occurred.

Must-watch new summer shows

During the early hours of February 14, 2013, Pistorius fatally shot his girlfriend, model Reeva Steenkamp. In August, he was formally charged with planned and premeditated murder. Pistorius maintains that he mistook Steenkamp for a home invader. During his trial, a psychiatrist testified that Pistorius, who says he's vulnerable and fearful as a double amputee, had an anxiety disorder that could've contributed to the fatal shooting. The prosecution then requested an independent look into his mental state because the defense was arguing he wasn't guilty due to mental illness.

Pistorius faces 25 years to life in prison if convicted of premeditated murder.