Coroners in Calderdale are trying to find anyone who knew a Brighouse woman who died in hospital.
Christine Marley, 53, of Whinney Hill Park died on Tuesday.
There were no suspicious circumstances surrounding her death.
It is thought that she had a niece living in Calderdale and a sister in Blackpool.
Anyone who knew Christine is asked to contact coroners officer Rod Holmes on 01422 354606.