[riccia]

Someone on an earlier Reddit forum pointed out there's a paratrooper division known as the Paradice at one time (https://old.506infantry.org/hiswwiiarticle02.html). Others pointed out the term has been adopted by any other number of groups, and one person suggested a cipher supposedly with the killer's last name is Paradice backwards. My guess is the misspelling is meaningful too but it's hard to say how.

[nostromo]

The theory is that when passed through morse code and reversed...

. -.-. .. -.. .- .-. .- .--. = ECIDARAP

can be rearranged to

.- .-.. .-.. . -. -.. -.-- . = ALLEN (DYE)

Since the primary suspect was Arthur Leigh Allen, some thought that the mis-spelling of "paradice" might have been his "signature."

I have no idea of this could be true or is a stretch.

[oedoedxef]

That is extremely interesting. If the FBI is correct that Allen is not the correct suspect, then it's a very strange (though not computationally rare) coincidence.