A witness heard "non-stop shouting" in the home of South African athletics star Oscar Pistorius shortly before his girlfriend was shot dead, the detective leading the murder investigation said on Wednesday.
Warrant officer Hilton Botha, a detective with 24 years on the force, also told the Pretoria magistrates court in a bail hearing that police had found two containers of testosterone and needles in Pistorius' bedroom.
The athlete's defence team disputed the finding.
Pistorius sobbed uncontrollably as Botha presented his testimony about the death of Reeva Steenkamp, 29.
The shooting and allegations that have emerged at the hearing have stunned South Africa and millions of people around the world who regarded Pistorius, who has no lower legs, as the epitome of triumph over adversity.
"One of our witnesses heard a fight, two people talking loudly at each other ... from two in the morning to three," Botha told the court. Pistorius' first call after the incident was to the manager of his high security complex at 3.19 am, Botha said.
After four hours of testimony, the hearing was adjourned until Thursday.
Botha, who arrived on the scene an hour after the shooting, challenged Pistorius' affidavit.
“I believe he knew she was in the bathroom and he shot four shots through the door,” the detective said, adding the angle at which the rounds were fired suggested they were aimed at somebody on the toilet.
Fresh charge over unlicensed arms
The Paralympic star is set to face a fresh charge of possessing unlicensed ammunition after firearm was recovered from his home by the police.
The charge has been added following the discovery of a .38 special firearm in a safe in Pictorius’ room.
According to Botha, Pistorius had the license for a 9mm pistol, which was incidentally the firearm mentioned in Pistorius’ affidavit on Tuesday when he said that he had shot Steenkamp.