The family of a pregnant mother killed in suburban Perth after being hit by a concrete block has been left devastated by the tragedy.
Diane Miller suffered a heart attack on Tuesday night when the block was thrown through the open window of her car at a Karawara shopping centre in what police have described as a senseless and unprovoked attack.
The 30-year-old Noongar woman died in hospital overnight after spending several days in a coma.
