03/25/2014 04:27 EDT | Updated 05/24/2014 05:59 EDT

Pistorius trial: Cell phone expert to give more data from Steenkamp's phone

PRETORIA, South Africa - The police cellphone expert who accessed messages from Oscar Pistorius' girlfriend saying she was sometimes scared of him is presenting more data in the champion runner's murder trial.

Capt. Francois Moller says he obtained more than 1,000 exchanges between Pistorius and Reeva Steenkamp.

Moller said he received as evidence two BlackBerry phones, two iPhones, two iPads and a Mac computer from Pistorius' house the day after Steenkamp was shot to death.

He began to discuss Tuesday how he pulled data from the phones.

He said the data on Steenkamp's phone would print to more than 35,000 pages.

It gives insight into the couple's relationship before Feb. 14, 2013. Prosecutors allege Pistorius fatally shot Steenkamp after a Valentine's Day argument. Pistorius says he killed her by accident.