The family of a missing California woman was given a heads up that there may finally be closure in the decades-old case — with officials telling them that the ending could be something they “don’t expect,” according to reports.

Kristin Smart’s mom, Denise, said the FBI recently contacted her and told her to prepare for a bombshell in the 1996 disappearance, the Stockton Record reported.

She said the agency warned her, “Be ready. This is really going to be something you don’t expect.”

The FBI also told her to secure a family spokesperson and that they “might want to get away for awhile.”

Her family said they haven’t received any information about when the potential break in the case will be made public.

“I wish I knew when because it’s very anxiety-producing,” Denise told the Stockton Record.

Her daughter was a 19-year-old freshman when she vanished from the campus of California Polytechnic State University at San Luis Obispo.

Kristin was last seen near her dorm after walking home from an off-campus fraternity party with several other students, CNN reported. But she never went inside her room or contacted friends and family again, officials said.

No arrests were ever made in the case and she was declared dead in 2002, CNN reported.