An ex-nurse in Germany has admitted at the start of his trial that he murdered 100 patients, making him one of the world's most prolific serial killers.
Detectives say Niels Högel administered fatal doses of medication to the people in his care - causing cardiac arrest - at two hospitals in northern Germany.
His motive, prosecutors say, was to impress colleagues by trying to revive the very patients he had attacked.
Högel, 41, is already serving a life term for six deaths while in his care.
He is now said to have killed 36 patients in Oldenburg and 64 in nearby Delmenhorst between 1999 and 2005.
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