Human remains discovered by construction workers in Colorado were identified on Thursday as those of a girl who went missing 34 years ago after performing at a Christmas concert.

The remains of Jonelle Matthews — who was 12 years old when she disappeared in December 1984 — were identified by police just days after construction workers found them while excavating for a pipeline, authorities said.

Jonelle, who would have been 47, was a 7th grader when she disappeared shortly after singing “Jingle Bells” with classmates at a 1984 Christmas concert.

She was last seen at 8 p.m. on Dec. 20, entering her family’s simple ranch-style home.

No one was ever arrested in connection with the disappearance.

Months later, then-President Ronald Reagan, whose administration worked on missing children, said the young girl “would have celebrated a happy 13th birthday with her family just last month.”

Reagan added, “But five days before Christmas, Jonelle disappeared from her home.”

The police department in Greeley County hopes that the body can lead to finally solving the crime.

With Wires