Nasty Suicide (born Jan-Markus Stenfors on 27 February 1963), sometimes known as Nasty Homicide, is a Finnish guitarist. He is most famous for being one of the founding members of Hanoi Rocks and the group's rhythm guitarist between 1979 and 1985. Hanoi Rocks was a Finnish rock band that combined elements of punk, glam rock, rock and roll, and blues. In 2010, Suicide also played a show with Michael Monroe in August 2010 at Ankkarock Festival, replacing Steve Conte who had to cancel due to family reasons. Since then, he has made some guest appearances with Monroe's band.
In 2022, Nasty returned back to music and formed the 7-piece Stenfors band. They played their debut invite-only show in the spring at On the Rocks in Helsinki and released their debut album Family Album in June of that year.