Per Wahlöö

Per Fredrik Wahlöö (5 August 1926 – 22 June 1975) was a Swedish author. He was perhaps best known for the works with his partner Maj Sjöwall on a series of ten novels about the adventures of Martin Beck, a police detective in Stockholm, published between 1965 and 1975. In 1971. He won an Edgar Award from the Mystery Writers of America. 
Personal life.
Wahlöö had a thirteen-year relationship with his colleague Maj Sjöwall but never married her, as he already was married. 
He died on 22 June 1975 from problems caused by pancreas surgery in Malmö, Sweden at the age of 48.
Bibliography.
Novels written by Per Wahlöö alone (see Martin Beck for joint collaboration with Sjöwall)