He was a violent criminal...
He had trouble keeping a job
He did not provide for his family good enough
He did not listen to instructions well.
Discredit the man anyway possible, in an effort to make his death more legitimate...
Repeat as necessary..
His death was a purely random event.
He was taken into custody on 31 prior occasions and survived all of them.
Hundreds of thousands of arrests will be made this year: in one case the arrestee happened to have a heart attack during the process - when is the last time that happened?
That's neither "legitimate" or "illegitimate" - it's just statistical randomness.