The Banshee

The Banshee is a popular Irish myth, depicting a woman who appears to announce the death of a person through wailing. She is often said to be an old woman, but descriptions vary as to her appearance. Some say she wears a grey cloak, while others say she sits combing her hair. Part of the Fae world, she is a bad omen. If more than one Banshee appears at once, it is said to announce the death of someone holy. One legend states that she will only appear for members of the O’Neills, O’Briens, O’Connors, O’Gradys and Kavanaghs families.
Some legends talk of a young woman brutally murdered who becomes a Banshee. You can read more about this on the 15th with DJ Doyle's book Banshee.
For more info check out: https://mythology.net/mythical-creatures/banshee/