Dead

When your Hit Point total is 0, if you are not stable and you have no Resolve Points remaining but would lose Resolve Points for any reason, you’re dead. If you have 0 RP when you are first reduced to 0 HP, you have 1 round to be healed or stabilized. If you have not been healed or stabilized by the end of your turn on the next round, you’re dead (see page 275 for more details on the dead condition).

You can also die from taking Constitution ability damage or ability drain equal to your Constitution score or from having a number of negative levels equal to your character level (see Ability Damage, Ability Drain, and Negative Levels on page 252).

Nonetheless, certain types of powerful magic and technology can restore life to a dead character, such as a 4th-level mystic cure spell or a raise dead spell.

Source

Core Rulebook pg. 250

Most monsters and NPCs don’t have Resolve Points, so injury and death work differently for them. A monster or NPC reduced to 0 HP is dead, unless the last bit of damage it took was nonlethal damage (see page 252), in which case it is knocked unconscious. If it is ever important to know exactly when a monster dies, such as if you want to capture the creature alive, the GM can decide that a monster reduced to 0 or fewer Hit Points with lethal damage dies in 3 rounds unless it takes any additional damage or receives healing. If a monster or NPC has Resolve Points, the GM can choose whether the monster dies at 0 HP or if it uses the normal rules for dying and death.

Source

Core Rulebook pg. 250

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