Stickam was a popular live-streaming site (active 2005–2013) often cited in internet lore due to disturbing incidents captured on live video. The "Stickam Girl" (Cami Guyer):

by Ritwik Raj follows detectives Samantha Granger and Liam Donovan as they track a serial murderer with a "chilling signature" [ Anime/Games:

The "Midnight Killer" is a ritual murder case featured in the Counter:Side Wiki

The title "Midnight Killer" is used by several unrelated fictional works and historical figures: Literature: A thriller novel titled The Midnight Killer