On February 24, 1986 Newlywed Sherri Rasmussen was murdered in her Van Nuys Condo on a morning that she made the fateful decision to stay home from work. Over the next few decades it took to solve this it became clear to each new detective that took it on this case was not at all what it seemed and the murderer had been under their nose the entire time.
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Sources:
https://en.wikipedia.org/wiki/Murder_of_Sherri_Rasmussen
https://www.newspapers.com/image/403996368/?terms=Sherri%20Rasmussen&match=1
https://www.youtube.com/watch?v=WtNMS7S0UhI
https://www.vanityfair.com/culture/2012/07/lapd-lazurus-murder-mystery-killer
Link 5
Link 6

Full interrogation
https://www.youtube.com/watch?v=t5ljpPTNvCM