Three unsolved murders, including that of a teenage girl will be examined again by Norfolk Police.
The body of Johanna Young, 14, was found submerged in a pit near Wayland Wood, near Watton, in 1992.
Other murders which will be re-investigated include those of Michelle Bettles and Natalie Pearman, both found in isolated beauty spots.
A new "cold case" team will also look into the disappearances of Kellie Pratt, Yvette Watson and April Fabb.
April, 13, was last seen in April 1969, cycling from her home in Metton to her sister's house in Roughton.
Yvette was 17 when she disappeared from the David Rice Hospital at Hellesdon, near Norwich, in March 1979.
Kellie Pratt, 29, disappeared from the red light area of Norwich in 2000 and Michelle Bettles, 22, was found strangled three days after disappearing from the same area of the city in 2002.
Natalie Pearman, 16, was found strangled in the Ringland Hills area of Norwich in 1992.
The cold case team, which has been appointed by Norfolk police's Major Investigations Team (MIT), is dedicated to cracking the county's longest-running unsolved crimes.
It is tasked with looking methodically at each case, studying the evidence already gathered and looking at ways new technology or public appeals can be used.
Police reopened another case - the headless woman of Cockley Cley - earlier this year and have already studied a string of potential leads.
The woman was found dead by the side of a country lane in 1974, but has never been identified.