Six-year old Teresa Cormack went missing in 1987. Her body was found 10 days later. For 15 years her murder remained unsolved, until investigators got the breakthrough of the century.

In 1987, on the 19th of June, the body of Teresa Cormack was found half buried under a tree on Whirinaki Beach, in Hawke's Bay.

It took 15 years for find her killer.

She left for school, but never arrived in class.

Former detective Keith Price worked the case in those early days and interviewed Jules Mikus after DNA technology pointed to him being the killer.

Go to this episode on rnz.co.nz for more details