Any scorpion can cause a fatality under the right conditions.
Of the over 1,000 scorpion species, only a handful routinely cause fatalities. The pedipalps and walking legs belong to the front part of the body, called the prosoma or cephalothorax. The last segment of the preabdomen extends to a tergal spine which bears the sting which has poison glands. They reach up to 5 inches in some species. But the largest is the male South African Rock Scorpion which can be over 8 inches in length.