,what are types of death that must be investigated?

Violence, accident, suicde (it won't let me type it but you get the idea), or homicide and those due to natural disease processes when the death occurred suddenly and without warning (poison).

Explanation:

Many states have different laws on which should be investigated but these are generally the ones that must be investigated.

Hope this helps!

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible