Research in Schizophrenia Research finds that 57 out of 7189 schizophrenia patients admitted between 1989 and 2013 died suddenly and unexpectedly during hospitalization; a rate significantly above that of the general population. Cardiovascular, respiratory and neurological abnormalities were implicated in most cases, however 6 cases (11.8% remained unexplained.
Ifteni, P., Correll, C., Burtea, V., Kane, J., Manu, P; Sudden unexpected death in schizophrenia: Autopsy findings in psychiatric inpatients. Schizophrenia Research. Online April 4, 2014. http://dx.doi.org/10.1016/j.schres.2014.03.011