(Undated) -- It's another wrenching day in court for "Blade Runner" Oscar Pistorius.
The South African Olympic track star is on the stand testifying for the first time today as his murder trial continues in South Africa. Pistorius sobbed as graphic images were shown of the night his girlfriend Reeva Steenkamp was killed. He opened his testimony by apologizing to Steenkamp's family. The Olympic and Paralympic sprinter insists he shot and killed Steenkamp thinking she was an intruder. The prosecution argues her death was the result of cold-blooded murder. If he's convicted, Pistorius could spend decades in prison.
Oscar Pistorius says he has trouble sleeping.