Yes, motive.
For the life of me, i cant think of anything this child could have done to anyone, that would have caused them, or someone for them, to murder her the way she was killed. She was bright, intelligent etc.
and being 1966 she could have ended up serving some time in another country for charity work.
And then i thought about the father, and politics, being 1966 with all that was going on back then with the war etc. and being in Chicago i thought about the mob, but then realize, back then, i don't believe the mob would have done this to the daughter, to get back at the father. No they would have just delt with the father directly, and left the wife and children alone.
The only motive, i can think of right now.
She was killed, not for something she did, nor was she killed for something she was going to do, but she was killed because of whom she was.
If we had the official investigation reports, where the detectives spoke with family, friends, people at her schools, her hang outs, the neighbors etc etc, perhaps we could speculate on a motive, a more probable motive, with the answers that were given during these interviews.
But we do not have access to that information, which is a shame, especially since, this case has gone on for so long, but like most cold cases, we can only speculate on things with the information we can prove to be true and provided to use by other members.
getting any validation, or confirmation on certain questions asked by members, on cold cases are few and far between, because the people with the answers, such as LE, are not talking, since its still an active investigation, even though its been a cold one, for a very very long time.