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Throughout five gruelling days on the witness stand, the Paralympic gold medallist contradicted himself, a nail in the coffin for his defence, said lawyers watching the case.
Criminal lawyer William Booth said Pistorius made textbook mistakes in the witness stand, adding that he was evasive, did not answer questions, and was argumentative.
During his cross-examination Pistorius changed his testimony to say he fired the shots at the door accidentally.
"He suddenly went on his own, he now got angry with Nel and he now is going to take him on," said Booth. "I think it's a desperate man."
Speaking from Cape Town Booth said: "His lawyer tried in re-examination very briefly to resurrect things, but I think he was probably sensible to leave alone.
"The more questions you ask somebody like Oscar, it could actually get worse," he said.
Booth said: "I think in retrospect they're probably regretting calling him as a witness... but the point is that he had to testify in his defence - he was the only witness to the incident."
Initially, Pistorius had said he believed he was under attack by an intruder when he fired four shots at the toilet door. That strategy sought protection for the use of deadly force under the principle of self-defence.
But in his cross-examination, the 27-year-old athlete changed his testimony to say he fired the shots at the door accidentally.
An accident is an entirely different defence, suggesting involuntariness.
Criminal law expert William Booth says Oscar Pistorius crumbled under Gerrie Nel's cross examination by presenting different versions of what happened on February 14.
WATCH:
Pistorius has also suggested he was not thinking rationally when he fired his 9mm pistol at a toilet door behind which was his girlfriend, Reeva Steenkamp. He said he "didn't have time to think".
His testimony went downhill the moment he took the stand, said Martin Hood, a Johannesburg-based criminal lawyer.
"He went into a dangerous situation with his firearm, safety disengaged, and he proceeded down the passage in what he described as a tactical manner," said Hood. "So all of his decisions were conscious, intentional decisions."
Pistorius has pleaded not guilty to intentionally killing Steenkamp, as well as to three other charges related to the reckless discharge of a firearm in a separate incident and the unlawful possession of ammunition.
‘A watershed in case’
Hood says it did not reflect well on Pistorius that he did not accept responsibility for firing a gunshot in an upmarket Johannesburg restaurant.
"The fact that he refused to accept responsibility for the gun discharging in Tasha's, though he had it in his possession and in his control," said Hood, "that's a watershed in the case”.
State prosecutor Gerrie Nel - nicknamed "the bulldog" for his tenacious courtroom performances - has picked at inconsistencies between Pistorius's evidence in court and his lengthy bail application.
"You are thinking of a version constantly and not dealing with the question," Nel accused Pistorius. "It's getting more and more improbable and you're tailoring more and more as we go on."
Pistorius blamed his legal team for inconsistencies between his accounts and claimed police moved key pieces of evidence that appeared to incriminate him, a sign, observers said, that he had abandoned his legal team's strategy.
