Clark Oderth Olofsson (later known as Daniel Demuynck; born 1 February 1947), is a Swedish criminal now living in Belgium.
He has received sentences for attempted murder, assault, robbery, and dealing narcotics and has spent more than half of his life in correctional institutions in Sweden.
Olofsson has been called Sweden's first "pop-gangster".
Olofsson was present at the Norrmalmstorg robbery whose events resulted in the creation of the phrase "Stockholm syndrome" to describe them.