NOt that I know of. They just feel those 3 cases are linked to each other. They said that they are looking at Karr as a possible suspect, so they were rechecking some of the facts in the cases, etc. MY take is that they are probably asking Boulder for Karr's DNA so they can match it to any DNA from these cases.
In light of Karr's "supposed" statement about 4 other murders (I say supposed because I haven't seen this before), it probably makes sense for them to at least check it out.
There was also mention of LE checking a similar case in TEnn. WOuld that make it four?