Colonel Mike Sales, a mobile phone records analysis expert, has given evidence on what he found on the iPad internet history of Oscar Pistorius.
Sales confirmed there was no browser history on the device prior to February 13 2013. The owner must have deleted it. Reeva Steenkamp died the next day.
Defence lawyer Barry Roux said he had not expected the witness and is due to cross-examine shortly.
Oscar Pistorius' defence will open their case on Friday and the Paralympic and Olympic athlete is expected to testify in the morning.
Oscar Pistorius was "probably not wearing his prosthetic legs" when he fatally shot his girlfriend, a forensic analyst told his trial.
Reporters discuss their views on the evidence while trays of coffee are passed along. At times it feels more like a cinema than a courtroom.