I have experienced a pax dying on a LH flight from Tashkent/Uzbekistan to FRA in 1998. This pax was already loaded onto the airplane as a patient accompanied by a doctor. A section of the cabin covering 6 seats had been reserved exclusively for this patient to enable him to lie flat during the trip. It turned out during the flight that he would never get up again, and family members travelling on the same flight freaked out. At least they had a curtain that they were able to pull around that cabin little section. Upon arrival in FRA, the other pax were only allowed to exit through the front door, even though there was a second set of mobile airport stairs at the back of the plane. This was done so that pax would not walk by the deceased person on the way out.