A former nurse in Germany accused of murdering 100 patients is due to go on trial in the northern town of Oldenburg.
Detectives say Niels Hoegel, 41, administered fatal doses of medication to the people in his care at two hospitals in northern Germany.
His motive, they say, was to impress colleagues by trying to resuscitate the very patients he had attacked.
Hoegel is already serving a life term for killing people in his care.
The latest trial, which is expected to last until May, follows toxicology tests on the exhumed remains of others.
Hoegel is said to have killed 36 patients in Oldenburg and 64 in nearby Delmenhorst between 1999 and 2005.
If found guilty of all the deaths, he would become one of Germany’s worst post-war serial killers.
