Bereaved individuals who either feel the death of their loved one is unexpected or violent may be at greater risk for suffering from major depression, posttraumatic stress disorder (PTSD) or complicated grief. Major depression is a psychiatric disorder characterized by depression and/or irritability that lasts at least two weeks in a row and is accompanied by a number of other symptoms, like problems with sleep, appetite, weight, concentration, or energy level and may also lead to the sufferer experiencing unjustified guilt, losing interest in activities he or she used to enjoy, or thoughts of wanting to kill themselves or someone else.