John Ingvar Lövgren

John Ingvar Lövgren (22 October 1930 – 9 February 2002) was a Swedish serial killer and rapist who confessed to four murders committed between 1958 and 1963 in the Stockholm region. Lövgren was convicted and sentenced to closed psychiatric treatment at Salberga prison. He went under the name Flickmördaren ("The Girl Killer"), because his last two victims were young girls. He was, at the time of his death in 2002, no longer in treatment due to poor health, which he had received from his cancer. He was buried at Sala cemetery.

The novel The Man on the Balcony released by Sjöwall/Wahlöö in 1967 was based on John Ingvar Lövgren and his crimes.