Key Questions in Oscar Pistorius Murder Trial

The shooting death of model Reeva Steenkamp by "Blade Runner" Oscar Pistorius has captured global attention and led to a blot of unresolved questions, but those questions will begin to be answered Monday when Pistorius goes on trial on a charge of premeditated murder.

Prosecutors in Pretoria, South Africa, say Pistorius, 27, intentionally shot Steenkamp, 29, in the bathroom of his home in a gated community on Valentine's Day in 2013 during an argument. Pistorius also faces three firearms charges.

PHOTOS: Oscar Pistorius Charged With Murder

The athlete, known as the "Blade Runner," does not deny that he fired four shots through a locked bathroom door, hitting Steenkamp th