A county coroner shall appoint one or more deputies or investigators to be approved by the judge of the circuit or by any circuit judge presiding therein, who must take and subscribe the oath prescribed by the constitution before entering upon the duties of appointment as a deputy coroner. The oath may be administered by any officer authorized to administer oaths in the county. The appointment must be evidenced by a certificate thereof, signed by the coroner, and continue at the coroner’s pleasure. The coroner may take a bond and surety from his deputy as he considers necessary to secure the faithful discharge of the duties of the appointment, but the coroner must always be answerable for the neglect of duty or misconduct in office of his deputy coroner. When duly qualified, as herein required, the deputy coroner may do and perform any or all of the duties appertaining to the office of the coroner.