NEW : Reeva Steenkamp family denies a Pistorius report that the runner is suicidal . NEW : Pistorius `` believes he has a purpose in life , '' his uncle says . BBC is accused of killing his girlfriend , Oscar Pistorius ' , on last month . Prosecutors say it was premeditated murder ; he says it was an accident .
NEW : Oscar Pistorius ' family denies a BBC report that the runner is suicidal . NEW : Pistorius `` believes he has a purpose in life , '' his uncle says . Pistorius is accused of killing his girlfriend , Reeva Steenkamp , on February 14 . Prosecutors say it was premeditated murder ; he says it was an accident .