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

June Steenkamp, mother of Reeva Steenkamp, inside the High Court of Appeal in Nov. 2017 Bloemfontein, South Africa. Oscar Pistorius could be granted parole on Friday after nearly 10 years in prison for killing his girlfriend. The double-amputee Olympic runner was convicted of a charge comparable to third-degree murder for shooting Reeva Steenkamp in his home in 2013. He has been in prison since late 2014. (AP Photo, File)

Olympian Oscar Pistorius stands following his bail hearing in Feb. 2013 in Pretoria, South Africa. Pistorius could be granted parole on Friday after nearly 10 years in prison for killing his girlfriend. The double-amputee Olympic runner was convicted of a charge comparable to third-degree murder for shooting Reeva Steenkamp in his home in 2013. He has been in prison since late 2014. (AP Photo, File)

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?