Here is a collection of pdf-documents that I have come across, that for whatever reason may have disappeared from their original sources, or may do so in the future. They do not only focus on killer whales but also on pilot whales, false killer whales, and smaller dolphins, and contain a great deal of useful information.
Marineland of the Pacific writes about Bimbo, the long-finned pilot whale, and observations of his behavior, up until 1963.
Marineland of the Pacific on Swifty, the first false killer whale in human care, her interactions with other species, and more on Bimbo the pilot whale.
Report by the U.S government on "Project Deep Ops", their early 1968-74 program with killer whales and pilot whales.
2015 Russian document on the care and training of their killer whales in the first time after being caught - Narnia, Nord, Orpheus and Grace.
Necropsy reports
Canuck, 1974
Kona 2, 1987
Samoa, 1992
Kilroy, 1978
Orky 2, 1988
Taku, 2007
Shawn, 1979
Kandu 5, 1989
Hugo, 1980
Nootka 1, 1990
Nami, 2011
Canuck 2, 1981
Kanduke, 1990
Ramu 1982
Kahana, 1991
Winston, 1986
Kenau, 1991