[citation needed] In a letter to his girlfriend, he stated the cells he had been in so far: On 6 April 1945, Kim Malthe-Bruun was executed in Ryvangen.

On 29 August Malthe-Bruun and 105 other victims of the occupation were given a state funeral in the memorial park founded at the execution and burial site in Ryvangen where his remains had been recovered.

Bishop Hans Fuglsang-Damgaard led the service with participation from the royal family, the government and representatives of the resistance movement.

[1][2]After the war his mother published a book about him titled Heroic Heart: The Diary and Letters of Kim Malthe-Bruun.

[citation needed] In the afterword to her work of historical fiction, Number the Stars, Lois Lowry likened the character Peter Neilsen, a resistance member, to Kim, possibly for his courage against the Nazis.