In view of the mounting death toll of COVID-19 worldwide and the complicating circumstances that commonly accompany such losses, we studied the grief experiences of 209 adult mourners who lost a loved one to coronavirus with a focus on self-blaming emotions and unresolved issues with the deceased. We found universal endorsement of one or more forms of self-blame (guilt, regret, shame) or unfinished business (UB), with over one-third of mourners endorsing all four experiences. Those having a closer relationship to the deceased reported both greater distress over UB and more intense and dysfunctional grief symptomatology. Strikingly, unresolved conflict, a major dimension of UB, accounted for nearly 40% of the unique variance in problematic grief, which bore no relation to time since the loss.