Fla. woman's defense parallels Pistorius "intruder" shooting

On July 27, 2011, a Florida woman named Caryn Kelley fearfully awoke from a deep sleep in the middle of the night to hear someone in her house. Kelley, who lived alone, feared an intruder, possibly a man who lived nearby who she'd been having a disagreement with.

Someone else in Kelley's position might have called 911, but Kelley had another option - her brother had given her a .38 caliber Charter Arms revolver for protection some years earlier. Kelley reached under her bed, took out the gun, cocked the hammer and aimed it at her bedroom door.

There was no stranger coming through the bedroom door - it was Kelley's boyfriend Phillip Peatross. The two had been arguing about their relationship earlier in the evening. In dramatic cellphone video shot by an Orlando police officer, Kelley tells the police what happened next.

In short, Kelley told cops she did recognize Peatross but the two struggled for the gun and it went off, striking Peatross in the face. He died instantly. But the police thought Kelley gave conflicting stories and did not believe her. She was arrested and initially charged with first degree murder, although the charges were later reduced to manslaughter.

After becoming a sensation at the 2012 Summer Olympics in London, Pistorius stands accused of shooting his girlfriend Reeva Steenkamp through a bathroom door because he says he feared the person on the other side was a dangerous intruder. Steenkamp was shot four times and died at the scene.

Pistorius was charged with premeditated murder. He says he will take the stand to explain his actions.

In the end, Caryn Kelley told Roberts she was too emotional "to get two words out." She did not testify at her trial in May 2013.

Pistorius says he will testify. His defense and the jury's decision will play out over the next few weeks.

"48 Hours" investigates the Caryn Kelley case Saturday at 10 p.m. ET/PT on CBS.