This document discusses grief and complicated grief, particularly in relation to intellectual disabilities. It provides an overview of stage theories of grief and discusses complicated or prolonged grief as a distinct diagnostic entity. Complicated grief is associated with certain risk factors and adverse outcomes. The document outlines a study conducted by the author and colleagues that examined complicated grief symptoms in adults with intellectual disabilities who experienced parental bereavement. The study found evidence of separation distress and traumatic grief symptoms, and a relationship between poorer ritual involvement and more complicated grief symptoms. It recommends further self-report and staff-report research to better assess complicated grief in this population.