[Black Rose]

This is what I use on my server.
Doesn't detect spectator change, you'll have to add that separately.

#include <amxmodx>
#include <hamsandwich>

public plugin_init()
{
    RegisterHam(Ham_Killed, "player", "fwd_HamKilled");
}

public fwd_HamKilled(Victim, Attacker, Shouldgib)
    set_task(1.0, "RespawnPlayer", Victim);

public RespawnPlayer(id)
{
    if ( ! is_user_connected(id) )
        return;
    
    ExecuteHamB(Ham_Spawn, id);
}