Not sure if this documentary/miniseries is available in all countries, but have started watching it and it´s very interesting.
It´s about one of the most mysterious cases ever in Argentina, the murder of Maria Marta García Belsunce in 2002. She was a sociologist who lived in an affluent gated community called Carmel Country Club. The murder was surrounded by very weird events from the beginning, and although i think her family didnt kill her, they seem sketchy and all sort of conspiracy theories have emerged about the case. I´m from Argentina so i remember the case very well, the media coverage was extensive.
Note: the article said that no arrests have been made, which is not correct, a neighbour and her husband were accused and later acquitted, her husband served some prison time, but i dont think he is the killer.