Mangs was sentenced to life in prison in 2012 for two murders and five attempted murders. In April 2013 he was convicted of another three attempted murders by the Malmö appeals court (hovrätten).
Mangs’ lawyers had based their application to the Supreme Court on weapons analyses, which tied Mangs’ weapon and bullets to the crime scenes.
The so-called Malmö sniper wanted the analysis to be repeated by technicians not previously engaged in the case.
The ruling in Sweden’s highest court puts a final end to what Malmö residents called a period of terror as an unknown gunman targeted mostly foreign-born victims in the southern city with a Glock 19 pistol.
Mangs was arrested in November 2010 after a string of shootings that took place in Malmö against people of immigrant origin.
He was charged with killing two men of immigrant origin, aged 23 and 66, in 2003 and a 20-year-old Swedish woman who had been sitting in a car with an immigrant man in 2009.
He was also charged with a slew of attempted murders in which he fired numerous shots with his Glock 19 pistol at homes, businesses and cars as well as out in the open, seriously injuring a number of people and coming close to killing many others.