Serial Killer Nurse

"Hi, my name is Niels. I'll be your nurse today" - Niels Hoegel introducing himself to his future victims. Niels Högel may be the most prolific serial killer in modern European history. Using a facade of a 'nice guy', he endeared himself to patients and staff at a German hospital before confessing to killing over thirty people. Later investigations would reveal, however, that the actual death rate was a lot higher.