In her youth she attended Bergen Cathedral School.
After working for more than 20 years in the Norwegian Ministry of Justice and the Police, where she held positions as deputy under-secretary of state (1988—1993) and permanent under-secretary of state (1993—1994), she became the first female Police Chief in Oslo in 1995.
In 2001 Killengreen headed a large reform in the Norwegian police when the number of regional districts were reduced from 54 to 27.
[1] In 2011 she was appointed as permanent under-secretary of state in the Ministry of Government Administration, Reform and Church Affairs.
This Norwegian law-related biographical article is a stub.