In the fifth day of the Oscar Pistorius murder trial in South Africa's Pretoria Magistrate's Court, Samantha Taylor, an ex-girlfriend of the accused murderer emotionally detailed the double-amputee Olympian's short fuse and penchant for firearms.

The 20-year-old Taylor said Pistorius, who's charged with premeditated murder of his late girlfriend Reeva Steenkamp's death, carried a gun with him "all the time."

She said on one occasion, an aggravated Pistorius "took out his gun and shot through the roof" following a fight with a policeman who'd pulled him over for speeding.

She said Pistorius and his friend Darren Fresco "were irritated and they said they wanted to shoot a robot" in the wake of the incident, which Pistorius attorney Barry Roux claimed had not happened. Taylor said that in another instance, Pistorius was followed home one night by a man, and responded by pulling out his gun and holding it to the man's window.

In crucial testimony to the case, Taylor said Pistorius routinely woke up during the evening paranoid there was a break-in in his home, and kept his gun next to the bed on a table -- and not under the bed like he claims was the case in the Steenkamp shooting.

The South African Times Live reported that Taylor, who