MCLivingDeathEvent

This event is fired just before an entity is killed. This allows you to run additional logic or prevent the death.

The event is cancelable.

If the event is canceled, the entity does not die.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.event.entity.living.MCLivingDeathEvent;

MCLivingDeathEvent extends MCLivingEvent. That means all methods available in MCLivingEvent are also available in MCLivingDeathEvent

ZenScript
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// MCLivingDeathEvent.getSource() as DamageSource

event.getSource();