Kaj Birket-Smith died in 1977.
Kaj Frederiksen died in 1991.
Kaj Birksted died in 1996.
Kaj Gnudtzmann died in 1948.
Kaj Franck died in 1989.
Kaj Christiansen died on 2008-01-14.
Kaj Gottlob died on 1976-05-12.
Kaj Uldaler died on 1987-04-06.
Kaj Hjelm died on September 15, 1983.
Kaj Mervild died on September 12, 1941, in Denmark.
Kaj Ulrik Linderstrøm-Lang died in 1959.
Kaj Gram Larsen died on October 30, 1999.
Niels Kaj Jerne died on October 7, 1994 at the age of 82.