Plenty of Fish was revealed as the most dangerous dating app in Britain in 2017. "Dating app Murder" Do you really Know who your meeting? Looks into the Murder of Katie Locke. Katie Locke, 23, met Carl Langdell on the dating app and returned to a hotel with him where he killed her, after authorities had been warned he had been making comments fantasising about raping and killing young women.

Carl Langdell killed Katie Locke and sexually assaulted her corpse on their first date at a Hertfordshire hotel on Christmas Eve in 2015. A pathologist described the attack as "forceful and prolonged".

Ms Locke was unaware Langdell was serving a suspended sentence for threatening to kill two people. Representing Ms Locke's parents, Nick Armstrong said Langdell was "dating multiple women across multiple websites" and "had used the hotel at least  ...