The shooting happened in a neighborhood a few miles south of us. (Tresine Drive is in Wonderview, just south of the s-curves on Highway 73. We live a few minutes' walk from Evergreen Lake.) From what I've heard, the victims were working in/on the house the shooting occurred in and probably knew the suspect. The sheriff's office says it wasn't a random shooting; I'll believe that since most crimes that happen up here -- aside from mailbox-bashing and similar vandalism -- aren't random.
I'll probably know more tomorrow and will update then.
Edit 1658: local news just reported Jeffco Sheriff cadets are searching a field alongside I-76 for weapons that may have been used in the shooting.