The death of a loved one is one of the most common potentially traumatic life events (Benjet et al., 2016; Stroebe & Schut, 2007). Around 10% of bereaved people after a natural death (e.g., old age) and 50% after an unnatural death (e.g. traffic accident) develops disabling and persisting grief symptoms that interfere with daily functioning (Djelantik et al., 2020; Lundorff et al., 2017), including prolonged grief disorder (PGD). Yet, relatively little is known about the development of grief over time. Latent trajectory studies can be used to examine differences in the course of grief symptoms over time. Latent trajectory studies are an extension of current research, which is dominated by examining means of symptom-levels or the presence/absence of a psychological disorder. Criteria for PGD were recently included in the text-revision of the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR; American Psychological Association [APA], 2022). Therefore, it is important to ...