Pistorius took the stand in a South African court Monday and said: "There hasn't been a moment since this tragedy happened that I haven't thought about your family."
The double-amputee athlete said he wanted to protect Steenkamp. He has said he killed her by mistake; prosecutors say he killed her after an argument.
Pistorius also said he is taking anti-depressant medicine and that he has sometimes woken up in terror, suffering from panic attacks.
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