You may be looking for:
- Succession
- Economy#Inheritance for when landless characters die
- Epitaphs
- Death modding
Death reasons 
include:
- Old age and poor health
- Diseases
- Execution
- Assassination
The Reaper's Due 
adds many event chains concerning death, including:
- Mourning events after the death of a lover, friend, or rival
- Chess with Death
- Masque of the Red Death