PRETORIA, South Africa (AP) — Oscar Pistorius will undergo psychiatric evaluation after the judge ruled at his murder trial Wednesday that his state of mind when he killed his girlfriend should be assessed by experts, possibly delaying court proceedings for two months.

The ruling was prompted by testimony by a psychiatrist on behalf of the defense that the double-amputee Olympic athlete has generalized anxiety disorder and that this may have influenced his judgment when he fatally shot Reeva Steenkamp through a toilet door in his home on Feb. 14, 2013.