I've been thinking that unless the bf/f comes clean and tells LE what he did with SL that night in 1975, and does it fairly soon, he'll be dead and gone and just about any chance we have of finding her will be gone with him. Of course, my premise (which is JMO) is that the bf/f killed SL and buried her somewhere.
So I've been daydreaming about approaches. These are just my wild ideas.
Begin by talking to LE about putting up a billboard on the route the bf/f takes to work every day, with SL's picture on it, asking for the public's help to get any information on her disappearance. Incorporate any suggestions they might have. (I realize it will be expensive and someone will have to pay for it.) Leave it up there at least a month. The idea is to make the bf/f face the billboard every day. It might even make some of his friends who see the billboard call him and ask him if he'd seen it. He *might* even worry a bit that someone out there might remember something about the night of the disappearance and go to LE with it.
Next, talk to the detective who is supposedly working on SL's cold case and see if he/she is interested in overhearing the bf/f's reaction to some made-up "news about SL" over the phone. If he/she could use the bf/f's reaction to possibly bring him in for questioning, or even put a tracking device on his vehicle(s) to see if he goes to any out-of-the-way location to see if SL's body has been discovered, then it may be worthwhile to set up a 'sting.'
The sting:
Ask MMQC (and/or SL's brother) to phone the bf/f, while LE is listening in. Begin the phone conversation with something like, "I thought you'd like to know we have some new information on SL's disappearance." At that point, the bf/f might say something like:
1. "I told you never to contact me again! I consider this harassment!"
or
2. "I'm listening. What is the new information?"
In response to 1, MMQC (and/or SL's brother) might say, "Well, I thought you'd like to know if we had any new information on SL, but apparently you are not interested."
or
In response to 2, MMQC (and/or SL's brother) might say, "The police dept. called me and asked me to come down to the station, b/c they said they have some new important information about SL and they didn't want to tell us over the phone. I thought you would like to know there's been a break in the case."
I think the bf/f is not a good man--but he seems to have some redeeming qualities (at least he may have). He's a homeowner, husband, father (I think) and has had a successful career. I think he lost his nasty temper and killed SL in a fit of rage. He's had to live with SL's murder all these years--and it must be taking a toll on him. He's matured and might be sick and tired of worrying if/when someone was going to find out what happened that night and report it to LE. It wouldn't surprise me if he's checked out SL's burial site at least once to ensure its "integrity." I wonder if his family owned a cabin or vacation home (or even rented a cabin or vacation home) that he might have thought was far enough out of the way that he could bury SL and no one would ever find her (yet was close enough to SI for a round trip to fit into the timeline that night). ?
As you can see by now, I've just gone wild with ideas! I am worried that unless LE can squeeze the bf/f for information, we may never know what happened and that's just unacceptable.
JMO!