Oscar Pistorius apologises for killing Reeva Steenkamp
           Oscar Pistorius: "I'm scared to sleep... I have terrible nightmares"     Continue reading the main story                                                                Pistorius trial     Pistorius testifies        Harding: Tough start        Week four round-up        Question of character          An  emotional Oscar Pistorius has apologised  to the family of girlfriend  Reeva Steenkamp, on the first day of his evidence at his murder trial.  In a trembling voice, he said he was "trying to protect" her and said he could not imagine the family's pain.           Mr Pistorius said he suffered "terrible nightmares" and often woke up smelling Ms Steenkamp's blood.           Prosecutors say he killed her in February 2013 after an argument. He says he mistook her for an intruder.           The athlete told Ms Steenkamp's relatives that there  "hasn't  been a moment since this tragedy happened that I haven't thought about  y...