Every law enforcement official, funeral director, ambulance attendant, hospital director or administrator or person having custody of the body of a deceased person, where the death is one subject to investigation under Section 3-3013, and any physician in attendance upon such a decedent at the time of his death, shall notify the coroner promptly. Any such person failing to so notify the coroner promptly shall be guilty of a Class A misdemeanor, unless such person has reasonable cause to believe that the coroner had already been so notified.