Vastavam web:Actually nurse has to serve the patients and try to heal their ailments. But the male nurse in Germany has killed more than 90 patients with vicious injections. A German nurse currently serving a life sentence in prison for murdering six patients may have killed 84 more, making him one of the country worst ever serial killers, police and prosecutors said Monday. Niels Hoegel, 40, was jailed in 2015 after being convicted of killing six people. Authorities have subsequently investigated hundreds of deaths, which included exhuming bodies of former patients in the clinics where Hoegel worked in Delmenhorst and Oldenburg in northwest Germany. Police told CNN they believe Hoegel killed 36 patients in Oldenburg between 1999 and 2001, and another 48 people from the hospital in Delmenhorst. Police say the number of victims may be even higher but the final number may never be known as some possible victims were cremated.In past hearings, Hoegel admitted to injecting patients with a drug that can cause heart failure or circulatory collapse so he could then try to revive them, French news agency reported.