This mods adds a couple of commands that allows you to see all the player deaths on your server. It also adds an alert message once a player drops below 3 hearts or gets attacked by a different player. You can customize when the alert message appears in the config file that gets created once you put the mod on your server.
Commands:
/playerdeathtracker list
/playerdeathtracker list <page>
/playerdeathtracker last <player>
/playerdeathtracker on
/playerdeathtracker off
/playerdeathtracker status
/playerdeathtracker reload
/playerdeathtracker clear
/playerdeathtracker alerts on
/playerdeathtracker alerts off
/playerdeathtracker alerts status
/playerdeathtracker alerts lowhealth on
/playerdeathtracker alerts lowhealth off
/playerdeathtracker alerts pvp on
/playerdeathtracker alerts pvp off