Nurse Lucy Letby's conviction on Friday for murdering seven babies and attempting to kill six others makes her one of the UK's worst medical serial killers.
Here are details of previous notorious cases:
Dr Harold Shipman
One of Britain's most prolific serial killers was convicted of killing 15 patients, but he is believed to have murdered as many as 250 between 1971 and 1998. He injected his patients with a lethal dose of morphine.
Beverley Allitt
Nurse Beverley Allitt was found guilty of killing or attacking 13 sick children. In the early 1990s, Allitt murdered four children by administering fatal doses of insulin.
Victorino Chua
Nurse Victorino Chua murdered two patients and poisoned others with insulin while working at the Stepping Hill hospital near Manchester in 2011. Chua described himself in a letter found at his home as "an angel turned into an evil person", writing that "there's a devil in me".
Colin Norris
The hospital nurse was jailed for life in 2008 with a minimum term of 30 years for murdering four frail and elderly patients and trying to kill a fifth at two hospitals in Leeds in 2002.
Benjamin Geen
Nurse Benjamin Geen gave patients potentially deadly injections between December 2003 and February 2004. Geen used different drugs on his victims, including insulin, muscle relaxants and sedatives -- all commonly used in the hospital but potentially deadly in the wrong hands.