Prosecutors and defence lawyers met in the Johannesburg courtroom again to give their final arguments for the Oscar Pistorius trial.

State lawyer Gerrie Nel started his argument by asking the court to disregard the South African athlete's testimony because he was a "deceitful and appalling witness." They insisted that Pistorius had deliberately murdered his model girlfriend, Reeva Steenkamp, on Valentines' Day last year.

The double-amputee Paralympian gold medallist had been pleading not guilty to the pre-meditated murder charge against him, even vomiting and crying uncontrollably as the court reviewed gruesome details of the case.

"We will argue that the accused's version should be rejected," Nel pleaded to the North Gauteng High Court. "The court should have no difficulty in rejecting his full version of events, not only as not reasonably possibly true, but in essence as being absolutely devoid of any truth."

The prosecution insisted that the 'Blade Runner' had been "concerned about the implications of his answers" instead of giving "truthful answers."

Pistorius' defense team, lead by top defence lawyer Barry Roux, claimed that the accused did not intentionally kill Steenkamp and had only shot the bathroom door thinking her to be an intruder. They depicted the star athlete as a "highly-vulnerable individual" and obsessed with safety.

Steenkamp's father, Barry, and Pistorius' father, Henke, both attended the Oscar Pistorius trial for the first time. Henke hugged his daughter, Aimee, before taking a seat right behind his son.

Should the court accept the prosecutor's request, Judge Thokozile Masipa will have to give her verdict based on circumstantial evidence and balance of probabilities for the case. The Oscar Pistorius trial could end with the athlete imprisoned for life should he be found guilty of premeditated murder.