Oscar Pistorius swore in a South African courtroom Tuesday that he believed he was shooting an intruder last week - not girlfriend Reeva Steenkamp.
As the Olympian's lawyer read a sworn deposition claiming her death was an accident, prosecutors scoffed, saying he was hell-bent on murdering her.
He is charged with doing so in premeditated fashion.
Pistorius says he believed an intruder was in his house on Valentine's Day and he felt vulnerable because he was in bed without his prosthetic legs.
That's why he fired bullets through a bathroom door, killing Reeva Steenkamp, who prosecutors counter was hiding from him and cowering in there.
Officials say Pistorius' motive was simple: "I want to kill."