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(CNN) -- After several days of intense grilling, the prosecution ended its cross-examination in Oscar Pistorius' murder trial.
Pistorius cried and his voice trembled at times during his testimony as prosecutor Gerrie Nel challenged the athlete's account of what happened the night he shot and killed his girlfriend, Reeva Steenkamp.
On Tuesday, the prosecutor asked who should be blamed for shooting Steenkamp.
"I'm not sure, my lady," Pistorius said, directing his answer to the judge. He repeatedly said he feared for his life and thought there was an intruder in his bathroom.
At times Pistorius cried and his voice cracked as he described finding his girlfriend slumped over after shooting her.
"I was saying, "Baby hold on. Jesus, please help me," he testified.
Nel has accused the double-amputee sprinter of "tailoring" his version of how he killed his girlfriend.
His questions have sought to undermine Pistorius' reliability and credibility and to portray the Olympic and Paralympic athlete as someone who was inventing his version of events to suit his story.
Nel, known in South African legal circles for his bulldog-like approach to questioning, has gone through minute detail regarding the early hours of Valentine's Day 2013.
On Monday, in yet another intense scrutiny of his story, the prosecutor again tried to highlight apparent inconsistencies between Pistorius' bail application and his testimony in court to show he is "tailoring his evidence" to suit the defense case.
"I am going to point out to you how improbable your version is," Nel told the runner, who sat immobile, staring ahead at the judge as he answered questions.
The prosecution's argument is that Pistorius shot Steenkamp intentionally after a heated argument. Pistorius does not deny shooting her but insists that he mistook her for an intruder.
"I did not fire at Reeva," Pistorius told the court, his voice breaking, causing a second brief adjournment in the day's proceedings so he could gather himself.
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