Hi everyone. I'm working on a story and I've gotten to the point where I need some input from people that are either knowledgeable about law enforcement or are an expert (someone that has done this for a living). Toward the end of my story, the protagonist discovers through her deceased father's "other woman" that her mother committed a murder back in the mid 80s. The protagonist's mother has been dead four years at the time she discovers any information about the murder, but she decides to turn her mother in posthumously. I need some information about what happens during this process from a legal area. What happens when someone provides information about a murder that was committed enough years ago to where the murderer is also dead? Especially if there is not any physical evidence left over from the crime (DNA wasn't a big thing in the 80s, right?). Also, when the protagonist turns her deceased mother in for murder, she later finds that her father was also a criminal, linked to two other murders (one that also involved his dead wife), and that he also assumed a fake name while on the run (meaning that the protagonist's family name isn't their true name). I'm not sure if there is a way to factor this in by connecting it with the initial "turning in" of the mother. For example: while opening the case regarding her mother, more information comes out about unrelated murders. Since there was not a DNA sample bank when these crimes were committed (in the late 60s and the mid 80s), what ways could the protagonist find out about the link in these murders? I hope I explained this well enough. If you have any questions and need me to clarify anything, please ask and I will do my best.