Oscar Pistorius has blood on his arm after shooting his girlfriend Reeva Steenkamp last year, a retired police officer has told his murder trial.
The court has also been shown a photograph of the South African athlete with blood on his shorts.
He denies murder, saying he shot his girlfriend after mistaking her for an intruder.
The prosecution says he shot Ms Steenkamp after an argument at his house on Valentine’s Day 2013.
On Thursday retired police colonel Schoombie van Rensburg told the court he followed a “trail of blood” up the stairs after arriving at Oscar Pistorius’ home.
Col Van Rensburg, who was initially in charge of the crime scene, said he immediately gave orders for it to be secured.
Defence lawyer Barry Roux has said that evidence from the scene, including eight watches, subsequently went missing.
Col Van Rensburg said he ordered photographs to be taken of the watches because they “looked expensive”.
He said he found the toilet door, through which Ms Steenkamp had been shot, locked.
He said the key was in the outside, whereas Mr Pistorius said he found the key on the inside, after breaking down the door.
The police officer said he found Mr Pistorius’ gun, a 9mm pistol, with blood on it lying on a grey towel inside the bathroom, along with a white mobile phone.
Before Col Van Rensburg began his testimony on Thursday, photographs of Ms Steenkamp’s bloodied head and face were shown in court, prompting Mr Pistorius to vomit.
The South African athlete, who has had both legs amputated, was sick several times on Monday while evidence from the post-mortem examination was presented to court and has also cried on several occasions.
The court was later told that photos of her body would be removed from the police file and not displayed in court.
The BBC’s Pumza Fihlani, who was in court, says images of the deceased’s body are often shown during trial and the decision could fuel a perception that South African courts give special treatment to the rich and famous.
The prosecution has been attempting to cast doubt on parts of Mr Pistorius’ story, including his claim that he was wearing his prosthetic legs at the time of the shooting.
A forensics expert has said the angle of marks on the door proved that Mr Pistorius was not wearing his prosthetic legs when he hit the door repeatedly with a cricket bat.
The defence lawyer showed the court a photograph of Mr Pistorius’ legs, with white socks and blood stains up to the knee.
The trial, which has lasted nine days, is expected to call on more than 100 witnesses. It had been set to last for three weeks but looks likely to be extended.
The state is seeking to convince the court that Mr Pistorius and Ms Steenkamp – a 29-year-old model, reality TV star and law graduate – had an argument before the athlete fired the shots that killed her.
There are no juries at trials in South Africa, and his fate will ultimately be decided by the judge, assisted by two assessors.
If found guilty, the 27-year-old, a national sporting hero dubbed the “blade runner”, could face life imprisonment.
Mr Pistorius said in his statement at the start of the trial that he woke in the early hours and walked on his stumps to the balcony, pulled in two fans, closed the sliding door and drew curtains. He said that shortly before he had spoken to Reeva, who was in bed beside him.
He said he rejected prosecution claims that a witness heard arguing coming from the house before the shooting.
2. Bathroom noise
Mr Pistorius said he heard the bathroom window sliding open and believed that an intruder, or intruders, had entered the bathroom through a window which was not fitted with burglar bars.
“Unbeknown to me, Reeva must have gone to the toilet in the bathroom at the time I brought in the fans,” he said.
Mr Pistorius said he approached the bathroom armed with his firearm, to defend himself and his girlfriend, believing Ms Steenkamp was still in bed.
Both sides agree four bullets were fired. Ms Steenkamp was hit three times.
Mr Pistorius said he fired his weapon after hearing a noise in the toilet which he thought was the intruder coming out of the toilet to attack him and Ms Steenkamp.
He said he was in a fearful state, knowing he was on his stumps and unable to run away or properly defend himself.
Mr Pistorius said he rejected claims that he was on his prostheses when he shot at the door.
A witness told the trial she woke to hear a woman screaming and a man shouting for help. She said that after the screams she heard four shots.
At his bail hearing last year, Mr Pistorius said he went back to the bedroom after shooting at the toilet door, then noticed Ms Steenkamp was not in bed.
Mr Pistorius said he then realised she could have been in the toilet.
5. Toilet door
Mr Pistorius said he went back to the bathroom but the toilet was locked, so he returned to the bedroom, pulled on his prosthetic legs, turned on the lights before bashing in the toilet door with a cricket bat.
Forensics expert Johannes Vermeulen told the court that the height of the marks on the door caused by the cricket bat suggest Mr Pistorius was on his stumps at the time.
6. Emergency calls
Mr Pistorius’s defence team has said he then called security at the gated housing complex and a private paramedic service before carrying Ms Steenkamp downstairs.
But security guard Pieter Baba told the trial he had called Mr Pistorius first, in response to neighbours’ reports of gunfire, and not the other way round.
He said Mr Pistorius had told him: “Everything is fine,” before calling him back a few minutes later and crying down the phone.