A psychiatrist had testified at Pistorius' trial that he had an anxiety disorder which may have contributed to him fatally shooting girlfriend Reeva Steenkamp last year.
Stander's testimony follows a shaky start by Pistorius' defense, where the Olympian's story of an accidental killing came under scrutiny as he was cross-examined by the chief prosecutor.
The double-amputee was asked by his defense lawyer to stand by the toilet door through which he shot. In a dramatic moment, he took off his prosthetics and approached the door in court.
The policeman says he also took nine photographs of Pistorius, who is seen in some of the images standing in blood-stained prosthetic legs in his garage.
Pistorius, lead defense lawyer Barry Roux and court officials gathered around the door ahead of today's proceedings, examining what appeared to be bullet holes marked with white tags in the wood.
Pistorius says he killed Steenkamp in his home by mistake, thinking she was an intruder. Prosecutors say he intentionally killed her after an argument.
Charl Johnson resumed his testimony today after telling the court a day earlier that he heard screams and gunshots on the night that Pistorius killed Reeva Steenkamp.
A court order last week allowed parts of the star athlete's trial to be broadcast on live TV but witnesses, like Burger, can decline being shown. An audio only feed of their testimony would then be broadcast.