The cause of death for Casey Johnson, the Johnson and Johnson heiress, who died on Monday 4th January 2010, has been revealed as diabetic ketoacidosis, according to a statement released by the Los Angeles County coroner in the case; many speculated, including Casey Johnson's fiancé Tila Tequila, that Casey died of a prescription drug overdose. Casey Johnson was just 30 years old when she died.

Cause of death for Casey Johnson and Brittany Murphy not related

Similarities had been drawn between the death of Casey Johnson and actress Brittany Murphy who died December 20th 2009; it has now been confirmed that Brittany Murphy died of a massive heart attack due to complications caused by community acquired pneumonia, multiple prescription drug use and iron deficiency anemia. There were no confirmed connections as to the cause of death between Casey Johnson and Brittany Murphy.

What is Diabetic ketoacidosis?

Diabetic ketoacidosis is caused by a serious complication in diabetes; according to the Mayo Clinic, diabetes ketoacidosis develops when the body is not receiving enough insulin. There are a number of symptoms of diabetic ketoacidosis which often develop quickly.