(Associated Press) A nurse who is already serving a life sentence for two murders may have killed more than 100 patients over several years at two hospitals in northwestern Germany, prosecutors said Thursday.

Investigators have completed toxicological examinations on patients who died during Niels Hoegel’s time as a nurse in the hospitals in Oldenburg and Delmenhorst, prosecutors and police in Oldenburg said. They found a further 16 cases in which he is suspected.

In late August, they said they had determined that he might have killed at least another 84 patients beyond the ones for whose murder he is already serving time. At the time, they said that they were awaiting toxicology results on another 41 fatalities, which have now been concluded.

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