Morning I want advices, my dad died on 2018 while he was being worked in the emergency clinic. T

Morning I want advices, my dad died on 2018 while he was being worked in the emergency clinic. The passings testament states it was unnatural demise, I have the reports that shows that the case was opened for examination on this however at no point heard from the individuals who were exploring in the future and I didn't do a follow up untill now how might I follow this case until I finally accept reality.