[DanishHaq]

https://sampwiki.blast.hk/wiki/SetPlayerWantedLevel.

I.e:

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
    if(killerid != INVALID_PLAYER_ID)
    {
        new newwanted = GetPlayerWantedLevel(killerid) + 1;
        SetPlayerWantedLevel(killerid, newwanted);
        SetPlayerWantedLevel(playerid, 0); // optional if you want, set the dead player to wanted 0 because he died
    }
    return 1;
}

Edit: Person above me was faster, but he did it wrong.