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 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 Steenkamp had been shot, locked.
He said the key was in the outside, whereas Pistorius said he found the key on the inside, after breaking down the door.
The police officer said he found 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 Steenkamp’s bloodied head and face were shown in court, prompting 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.