You could look how long your audio file plays and use Invoke to let your player respawn after the file is finished. Here is some c#

public AudioClip deathmelody;
public float length;
void OnDeath(){
    audio.PlayOneShot(deathmelody);
    Invoke("Respawn",length)

This is what the Scripting manual says to Invoke

function Invoke (methodName : string, time : float) : void

Description

Invokes the method methodName in time seconds.