Investigators combed through centuries of records covering thousands of people to identify the fourth and final victim of a notorious homicide case, known as the Bear Brook murders in New Hampshire.

Investigators announced Sunday that the girl was identified as Rea Rasmussen, who was born in California in 1976 and was killed in the late 1970s or early 1980s. Her body was one of four found in metal barrels in Bear Brook State Park in Allenstown, New Hampshire, which is outside of Concord. Advertisement

Jennifer Randolph, of the DNA Doe Project , explained her team's efforts Monday during a news conference about the developments.

Randolph said that the DNA profile on its own was inconclusive and that efforts had to stretch back in time.

"They ultimately assembled a tree containing a

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