Former Girlfriend of Oscar Pistorius Takes the Stand in His Murder Trial of Reeva Steenkamp

New and dramatic testimony of Olympic athlete paints a picture of man with a short fuse and a quick temper.
3:00 | 03/07/14

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Transcript for Former Girlfriend of Oscar Pistorius Takes the Stand in His Murder Trial of Reeva Steenkamp
And today, new and dramatic testimony in the murder trial of Oscar Pistorius, charged with gunning down his girlfriend, reeva steenkamp. Today, a former girlfriend took the stand. ABC's hamish Macdonald was in court for us today. Reporter: There is no question Oscar Pistorius killed reeva steenkamp in the early hours of Valentine's day last year. This court will decide if it was murder. The defense says screams neighbors heard that sounded like a woman could be Pistorius. Today, damaging testimony from his former girlfriend. That is not true. He sounds like a man. Reporter: Samantha Taylor testified that Pistorius kept a gun with him at all times, even in bed. She wept as she told the court why she and Pistorius broke up. He cheated on me with reeva steenkamp. Reporter: While witnesses are forming a picture of Pistorius as an angry, perhaps reckless man, friends say that is not the person they know. Ebba gundy has been a friend for almost a decade. Her son hafildi was born with a similar disability to Oscar. When you have had a moment with Oscar,, what do you see in him now? Well, you see Oscar still, that's a good thing. Do you see regret? Do you see sorrow? Yes, oh yes. More than you can imagine. Reporter: Pistorius is pleading not guilty to all charges. The trial resumes on Monday. Hamish Macdonald, ABC news, Pretoria South Africa.

This transcript has been automatically generated and may not be 100% accurate.

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