"Brother deceased aged 42"

All my family know is that my brother became ill in city centre in Birmingham. He walked into Boots walkin centre who called an ambulance, it was confirmed my brother was having an heart attack. We lost him from that on that same day/what I myself and family especilly his broken hearted mother is the fact no one has ever spoken to my mom about the loss. The only 2 people were 2 policemen knock the door to say her youngest son of ten childen was dead. M y mom wants answers , I thought a top doctor who certified the death would at least invited her to the hospital to explain the death, what symptons my brother presented with, what the doctors tried to do. The walk inn centre say one story and the city hospital admin staff say another., we just want to know the truth and we will keep fighting for my brother