STORY HIGHLIGHTS
- NEW: A decision in the bail hearing could come as soon as Thursday
- Charges against investigator stem from 2009 incident, spokesman says
- Botha and other officers fired at a minibus they were pursuing, he says
- The officers were allegedly drunk at the time, spokesman says
(CNN) -- The sensational case of Oscar Pistorius took a new turn Thursday when police said the lead investigator is facing seven counts of attempted murder stemming from an incident four years ago.
That investigator, Hilton Botha, and several other police officers apparently fired at a minibus they were chasing in late 2009, spokesman Neville Malila told CNN affiliate eNCA.
The officers were allegedly drunk at the time, the spokesman said.
They were arrested on seven counts of attempted murder -- for the number of occupants in the minibus, the spokesman said.
They were also charged with using firearms under the influence of alcohol, and all of them appeared in court.
The charges were provisionally withdrawn, but the Director of Public Prosecution reinstated them Wednesday and plans to move ahead on the charges later this year, the spokesman said.
The revelation comes as final arguments are set to begin in the bail hearing of the Olympian charged with premeditated murder in the killing of his girlfriend, model Reeva Steenkamp, in the early hours of Valentine's Day. A ruling in the hearing could come as soon as Thursday.
Pistorius has said he thought he was shooting at an intruder.
But Botha told the court Wednesday that Pistorius, 26, wasn't acting in self-defense when he shot through the door of a toilet room in the bathroom of his home and killed Steenkamp.
Botha said he believes Pistorius knew Steenkamp was on the other side of the door. He didn't explain why investigators think that but suggested Pistorius was specifically aiming to hit the toilet where Steenkamp had gone.
But he also said investigators have found no evidence that is inconsistent with Pistorius' story.
Bail hearing
Prosecutors spent much of the hearing Wednesday focused on the bathroom of Pistorius' Pretoria home, where authorities say the track star shot Steenkamp three times, in the hip, elbow and ear.
Bullet trajectories show that Pistorius had to turn left and fire at an angle to aim at the toilet, Botha testified. Had he fired head-on into the door, he would have missed her, Botha said.
Defense attorney Barry Roux disputed that, saying the evidence does not show there was an effort to aim at the toilet.
Prosecutors are trying to prove Pistorius intentionally fired on Steenkamp, 29, in a premeditated attempt to kill her. Pistorius and his lawyers argue he mistook her for an intruder and killed her accidentally.
Pistorius said in a statement read Tuesday by his lawyer that he believes Steenkamp slipped into the bathroom when he got up to close the balcony door in his bedroom in the early hours of February 14.
Hearing noises and gripped with fear that someone had broken into his home, Pistorius said he grabbed his gun, yelled for the intruder to leave and shot through the toilet-room door before realizing the person inside might have been Steenkamp.
Roux said Wednesday that the defense team believes Steenkamp locked the door when she heard Pistorius yelling for the intruder to leave. He also said Steenkamp's bladder was empty, suggesting she had gone to the bathroom as Pistorius claimed.
Botha also said police believe a blood-stained cricket bat found in the bathroom was used to break down the locked door to the toilet.
Pistorius said in his statement that he used the bat to break down the door in an effort to get to Steenkamp to help her.
Botha agreed with the defense contention that, other than the bullet wounds, her body showed no sign of an assault or efforts to defend herself.
But prosecutors and Pistorius' defense battled over allegations that testosterone and needles were found at the home, as well as the quality of the police investigation.
Did investigators make errors?
Amid speculation by outsiders to the case that steroids or other drugs could have somehow played a role in the shooting, Botha testified that investigators found two boxes of testosterone and needles at Pistorius' home.
Under questioning by Roux, however, Botha said he hadn't read the full name of the substance -- which Roux said was an herbal remedy called testoconpasupium coenzyme -- when investigators took the materials into evidence. A quick Internet search on the name of the substance yielded no results.
Roux also said the defense forensics team found a bullet in the toilet that police had missed and noted police had failed to find out who owned ammunition found at the home or photograph it.
Investigators also went into Pistorius' home without wearing protective foot covers to prevent contamination of the crime scene, Roux said. Botha conceded that was true and said it was because police didn't have any more of the covers left.
Roux questioned police arguments that a witness heard sounds of an argument before the shooting. The witness, Roux said, lives 600 meters (more than a third of a mile) from Pistorius' home. Prosecutor Gerrie Nel countered that the witness lives 300 meters away.
Would he run?
Botha told Magistrate Desmond Nair that investigators believe Pistorius is violent and might flee if released from jail.
He described two police encounters with Pistorius, one in which Botha said the track star asked someone else to take the blame when a gun went off at a Johannesburg restaurant.
Police said the second incident took place at a racetrack, where Pistorius allegedly threatened to assault someone.
Authorities have also said they have responded to previous domestic incidents at Pistorius' home, but have not elaborated.
In his statement Tuesday, Pistorius said he and Steenkamp were deeply in love and said he was "mortified" over her death.
High hurdle
Defense attorneys are trying to overcome South African law, which makes it difficult for defendants accused of premeditated murder to get out on bail. The law requires evidence of "exceptional circumstances" to justify release.
Nair upgraded the charge against Pistorius to premeditated murder Tuesday, saying he could not rule out the possibility that the track star planned Steenkamp's death. But Nair said he would consider downgrading the charge later.
In his statement Tuesday, Pistorius said he would not try to flee or influence any witnesses if he is allowed out on bail, and he said his release wouldn't be a danger to public order.
