A doctor involved in treating the Boston Marathon bombing suspect who died in a gun-battle with police says he had injuries head to toe and all limbs intact when he arrived at the hospital.

Dr. David Schoenfeld (SHOW’-en-feld) says 26-year-old Tamerlan Tsarnaev was unconscious and had so many penetrating wounds that it isn’t clear which ones killed him. The doctor says a medical examiner will have to determine the cause of death.

Schoenfeld says the suspect was in cardiac arrest and lost a pulse as soon as he arrived at Beth Israel Deaconess Medical Center following a shootout with police in the Boston suburb of Watertown early Friday. Doctors tried numerous treatments for about 15 minutes before pronouncing him dead.

A photo of the Tsarnaev’s body was leaked to the celebrity gossip website TMZ.

The doctor said “we did everything we could” to try to save his life.