People with mental health or substance use disorders (MH/SUDs) have a higher risk of death when compared to the general population, with the highest rates of mortality being among people with co-occurring MH/SUDs (Dickey, Dembling, Azeni, & Normand, 2004; Muhuri & Gfroerer, 2011; Roerecke & Rehm, 2013; Rosen, Kuhn, Greenbaum, & Drescher, 2008; Walker, McGee, & Druss, 2015). Reducing the premature mortality associated with co-occurring MH/SUDs is an ongoing and important…