Ok so I heard the parents tonight and am taking the advice to channel my Caylee Anthony frustration over onto this case. It's the first I've dug into the case and here are my thoughts on what I've seen so far about it. Please feel free to give input on these points.
The killer has the 2005 sexual assault which a cold hit was made on his DNA. Assault occurred in Fairfax, VA near a grocery store. Sketch made, african-american, likely in his late 30s now.
Body found on Anchorage Farm, lots of speculation he had to know about the farm. Apparently this lead nowhere on follow-up.
Shirt of Morgan's found in Nov 2009 few miles from concert arena. The parents said tonight it is tied to another crime but could not elaborate (?)
Apparently this lead as to possible home area of killer lead nowhere.
Common thread in the two incidents is severe violence against the two women. The woman in 2005 got away as someone was seen nearby and the killer fled.
Where Morgan's body was found, the concert, and the t-shirt are all in a relatively small radius. The two crimes being four years apart, and with the sketch having been made after the first one, I suspect he moved to Charlotesville to not feel so hunted in Fairfax. I would assume records have been checked for African American males in this age range who have moved in just such a fashion in the last few years.
I would also suspect a rap sheet of at least domestic violence, possibly other rapes, prostitute assaults, etc. If I was an investigator on the case I would pass his sketch around to prostitutes, as this sadist will need fixes more often than every few years. My impression is he is a loner type with little in the way of friends and romance, and is unattractive. He thus considered Morgan quite a trophy, kept her necklace and clothing items as a memento, and uses it for stimulation when fantasizing later about the rape.
The ditching of the t-shirt to me is a symbol of a killer who wants to get caught, leaving a clue behind to eventually get caught with. Also, the way it was left behind a month later tells me he perhaps enjoyed the news coverage the case initially got, and wanted to stir up the media again. For a low-life loner like this the fame and attention would have been tantalizing.
More than likely he skipped town, as he did in Fairfax a few years earlier after the sexual assault. Based on his last move, he probably has not traveled far. He is carefully searching for his next victim.
I get the impression that Morgan was in the wrong place at the wrong time, that the killer had not pre-selected her before this date. Morgan, being at a rock concert, appears to have been under the influence of drugs and alcohol. Ecstasy is common at concerts, and would have caused her to have her guard down in getting in a stranger's vehicle.
Hope they find this killer.