AKIPRESS.COM - Toxicology tests suggest a German former nurse murdered at least 100 people at two hospitals where he worked, prosecutors say.

Detectives believe Niels Hoegel, who is already serving a life sentence for two murders, systematically administered fatal doses of heart medication to people in his care.

He wanted to impress colleagues by resuscitating them but many died.

Fresh charges against him are expected next year.

Hoegel is now said to have killed 38 patients in Oldenburg and 62 in Delmenhorst, both in northern Germany, between 1999 and 2005.

Investigators say he may have killed more but potential victims have been cremated.

If found guilty of all the deaths, he would become one of Germany's worst post-war serial killers, BBC reported.