BERLIN, Germany (AFP) — German prosecutors said Monday they were investigating dozens of suspicious cases which could be connected to a palliative care nurse already jailed for the murder of 10 patients.

The man — partially identified by German media as Ulrich S., who worked in a hospital in Wuerselen near the western city of Aachen — was jailed for life in November after being convicted of 10 counts of murder and 27 of attempted murder.

Prosecutors in that earlier trial said he injected the mostly elderly patients with large doses of sedatives or painkillers, with the simple aim of reducing his workload during night shifts.