Oscar Pistorius: Inside Relationship With Slain Girlfriend

The double amputee Olympic runner has been charged with his girlfriend's murder.
2:51 | 02/15/13

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Transcript for Oscar Pistorius: Inside Relationship With Slain Girlfriend
First, a stunning fall from gre for oscar pistorius. For the world, he and reeva steenkamp seemed like the perfect pair. Young, glamorous, wealthy and succ now, her life is over and his is shattered. Paula faris is here with the latest. Good morning, paa. Repter: Only recently had oscar pistorius and reeva steenkamp begin dating. By all accounts, they had a fabulous relationship with no signs of violence. She was the gorgeous model. He was the inspirational athlete. Together, oscar pistorius and reeva steenkamp had the potential to become south africa's golden couple. Instead, steenkamp is dead. And this morning, pristorius is facing charges he murdered her. Pistorius won hearts in london last summer as the blade runner, the first double-amputee to complete at the olympics. I don't think I'd be the same person today if I had legs. Reporter: Beloved for his remarkable story. His legs amputated before he turned 1. His succeshim an endorsement deal with nike, including this ad. Some say he was fast and reckless off the track. He was an adrenaline freak. Reporter: Did he have a dark side? I did not see any dark side. I worried about oscar hurting himself in various ways because he can be very reckless. Reporter: "New york times" contributing righter, michael sackolov spent time with pistorius last year. And saw his fascination with guns. That previous night, he heard somebody in the house. And he wandered downstairs with his gun. Reporter: Pistorius reportedly sleeps with a 9 millimeter handgun, the same kind police say he used to kill steenkamp, the up-and-coming model he had been dating for a few months. Steenkamp, an "fhm" cover girl, was successful in her own right. She wanted to create her own identity in the media. Not just of oscar's girlfriend. Reporter: The 29-year-old had been modeling for 15 years. And was set to star in a reality show. Her grieving family said she was beauty and brains. A law graduate who took on social causes and loved life. She was passionate about certain and protection of children. Her plans were for the future were so inviting. She has so much going for her. Reporter: And s haunting tweet just hours before her valentine's day death said, quote, what do you have up your sleeve for your love tomorrow?

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

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