The Harrington's are going to have a presser Oct 17th on the bridge where Morgan went missing.
IMO someone in LE is telling the Harrington's of findings in this case in relation to Morgan . The Harrington's have waited long enough and when something of importance is told to them regarding their daughter, they leak it. Then LE confirms it without going into detail.
I will say this, if it were my daughter and I found out JM is connected I would be standing on that bridge and screaming my lungs out with anything I knew. Course the Harrington's are not me, they are graceful and patiently waiting for justice.
To ensure JM gets a fair trial might be the best thing for the Harringtons to do. GIving out too much info can impede a case, make it difficult to have a fair trial and have to have accommodations made. Hopefully, they are operating with all that in mind.