SARS-CoV-2 is a newly identified virus that causes COVID 19, spreading very fast in the world. Uncontrolled diabetes in pregnancy can increase the risk of pregnancy outcomes. Pregnant women are at high risk of developing a viral infection, like SARS-COV and on the other hand, diabetes ketoacidosis (DKA) which is coupled with COVID-19, can increase maternal mortality. The patient was a 27-years-old female G3P1L1Ab1 with a history of a previous cesarean section. On 26 March 2020, a fetal ultrasound revealed intra-uterine fetal death (IUFD) and also diagnosis of DKA and COVID-19 in the patient that she was expired eventually due to the uncontrolled DKA. In this case report, a pregnant woman with a diagnosis of IUFD, DKA and COVID-19 simultaneously is described. To the best of the authors of this paper's knowledge, no previous work has been reported for the comorbidity of diabetes and COVID-19 in pregnancy, but it seems that the coincidence of the above-mentioned diseases can delay the recovery period and also can increases maternal and fetal mortality. When DKA and COVID-19 appear in the patient simultaneously, we cannot control DKA by the routine protocol treatments of DKA which were used formerly.