A German doctor wept as she told a court she was not guilty of deliberately killing 13 cancer patients with morphine overdoses.
The treatment was not appropriate for most of the patients, the doses were too high in the other cases, and the patients, aged between 52 and 96, were not all terminally ill, the court heard.
But Mechthild Bach (59) contested that and denied knowingly having caused any deaths.
Bach is going on trial for the second time. Her first trial collapsed last year because a judge fell ill. The deaths occurred at a hospital in the Hannover suburb of Langenhagen.