A rare but recurrent type of cold case is important to give attention to, in spite of these crimes fading into obscurity: missing children, specifically infants, of murdered mothers. Below are the notable examples of murdered mothers and their misisng infant children I know:
https://charleyproject.org/case/allyson-kathleen-dalton
Allyson Dalton is the missing infant daughter of her mother Sylvia, who was found stabbed to desth in her home.
https://en.wikipedia.org/wiki/Marvin\_Gabrion
Marvin Gabrion was convicted of the murder of Rachel Timmerman, who was found dead and sunk in a lake after she reported Gabrion for kidnapping and rape. She disappeared along with her daughter Shannon, who to this day never been found.
https://en.wikipedia.org/wiki/Disappearance\_of\_Arianna\_Fitts
Arianna Fitts remains missing, after her mother Nicole was found murdered in a shallow grave outdoors.
And some cold cases I find significant and adjacent to the above crimes:
https://charleyproject.org/case/susan-libby-marable
Susan Marble is a missing mother of a child who she lost custody of. The prime suspect of her disappearance is a mam she reported for rape, eventually convicted at trial and now deceased.
https://en.wikipedia.org/wiki/Terry\_Peder\_Rasmussen
Terry Peder Rasmussen is a serial killer of women he seduced into relationships, as well as their children in his earlier murders. In recent years, his birth daughter Rea Reed has been conclusively identified. Her mother Pepper Reed remains missing and is presumed murdered by Rasmussen.