Systemic lupus, folie a trois and homicide.

Folie a trois is a syndrome characterized by the transfer of delusional ideas from one person to two other persons. This condition rarely ends in the murder of any involved and we are unaware of where the primary case had the diagnosis of acute psychosis in systemic lupus erythematosus (SLE). We present a case report of folie a trois resulting in murder, secondary to acute psychosis in SLE.