A well written suicide note can not only help confirm that you knew what you were doing - that you had mental capacity to die - but it will help keep others safe. It is much more difficult for the police to charge a loved one with helping you suicide - even if they were with you when you died - if there is a hand- written or signed statement from, you outlining why you did what you did. If you don’t mind that your death will be known as a suicide, then the note can be left somewhere obvious.
If a death takes place outside of a hospital, hospice or other medical institution (eg. at home), it is normal practice upon ‘discovering’ the death, that the local doctor be called. Upon arriving at the house, the doctor has two formal duties.
Firstly, the doctor will confirm death. They will do this by carrying out a number of simple tests in order to establish that the person is indeed dead, not simply in a catatonic or comatose state.