He died of a brain tumour aged just 57. Stäckel left behind his wife, daughter and remaining son. Elisabeth Stäckel outlived her husband by nearly twenty years, passing away on 6 May 1938, on what would have been her 47 wedding anniversary.
Namatay siya ng isang utak tumor lamang na may edad na 57. Stäckel kaliwa sa likod ng kanyang asawa, anak na babae at natitirang anak na lalaki. Elisabeth Stäckel outlived kanyang asawa sa pamamagitan ng halos dalawampung taon, daan sa 6 Mayo 1938, sa kung ano ang kanyang 47 kasal anibersaryo.