Maikai, your Dad might remember the case but it was 35 years ago.
The Mackle case kidnappers were eventually paroled. I posted the most recent link I could find below but there's not much detail about the actual events.

Both Barbara and JonBenet were the daughers of wealthy business executives. Both daughters and their family were personally targeted by the predators, and both had connections to Georgia. (good southern common sense?)

JonBenet, and Barbara were both approached by intruders, and removed in their night clothes. Both families were instructed to collect money in certain denominations, and to wait for further instructions
in exchange for the safe return of their daugther. Both victims were held captive, and eventually found below ground level in dark confined spaces with various objects left by the kidnappers.

In both cases victims were bound at the wrists, and subdued to render them helpless. JonBenet Ramsey with a stun gun, and Barbara Mackle with chloroform.

http://www.palmbeachpost.com/accent/content/auto/epaper/editions/sunday/accent_f3ffc2aad1c3525600ba.html