With Brittany Murphy dying, drugs are an obvious question. However, Simon Monjack, Brittany Murphy’s husband has said: no autopsy. That’s what he told the staff at Cedars-Sinai hospital, where the 32-year-old actress was pronounced dead earlier on Sunday.

The cause of 32 year old actress Brittany Murphy dying of cardiac arrest on Sunday morning is still unknown. Cardiac arrest is uncommon in young adults, risks of non-congenital cardiac arrest increase with age. Some of the common causes of cardiac arrest are congenital heart defects, drugs that affect the heart rate, an electric shock or other trauma to the chest.

A young adult such as Brittney Murphy, dying at age 32 of cardiac arrest, is unusual. Risk factors of smoking, family history of heart problems, a personal history of heart problems, a lack of exercise, etc. can contribute to the risks of heart failure, but in a young adult the most common explanations are congenital heart problems and substance abuse. According to the American Heart Association, heart abnormalities can be affected by adrenaline, which triggers cardiac arrest after strenuous physical activity or during stressful events. In addition, some medications, including illegal drugs such as cocaine, can cause arrhythmias, which lead to cardiac arrest.