I think any profile would resemble pretty much what has been said here...maybe a day laborer, or casual worker, possibly works at one of the factories in the general area, not a lot of close ties, may be a hunter, white, possibly Hispanic, aged 35-50, etc...not sure it would help much.
What might help is reminding the public of various factors or behaviors that may have occurred just prior to, or just after the crimes. Changing appearance, i.e growing facial hair, or familiar clothing or footwear missing since, calling in sick or skipping work, getting rid of a vehicle, etc...