“There were only two people in the house, there were no eye witnesses,” he told the court on Monday.
“The State’s case is based on circumstantial evidence… and on what the neighbours heard…and lead ballistic and forensic evidence.’
He said the State would prove that Pistorius killed Steenkamp with direct intent.
Pistorius pleaded not guilty to the charge of murder, and contraventions under the Firearms Control Act including possession of ammunition without a licence.
The 27-year-old is accused of murdering Steenkamp at his Pretoria home last year.