Anders Behring Breivik is set to give his final day of evidence to a Norwegian court on the killings he carried out last July.
He has already admitted to the Oslo bombing and island shootings that left 77 people dead.
The main aim of the trial is to decide whether he was sane.
On Friday, he described shooting people who were "begging for their lives".
The 33-year-old said he was normally a nice person but had shut off his emotions to carry out the attacks.