The vital question may linger forever: Did Oscar Pistorius know he was shooting at his girlfriend?

CAPE TOWN, South Africa — In the decade since Oscar Pistorius pulled the trigger four times on his 9mm pistol, firing into the head and body of girlfriend Reeva Steenkamp as she stood inside a locked toilet cubicle in his home, the vital question has still never been answered: Did the world-famous Olympic runner know he was shooting at and killing his girlfriend that Valentine’s Day in 2013?