The 1/28/10 episode of
Bones featured a gay plotline. The murder victim was a gay dentist who for recreation played on a gay full-contact (American) football team. The suspects included the victim's ex, a (very hunky) guy who engaged in bow hunting (made me think of Brad--in a good way), and the victim's current boyfriend, a closeted ex-Marine who played with him on the football team.
One nice thing about the plot featured Booth, a former Marine sniper, saying very casually and almost nonchalantly that gay guys had saved his life in battle many times.

I won't say anything more about the plot except that in the end, the murder actually wasn't a gay-bashing.
I'm not sure what the point was to having the victim's remains found in the middle of a Civil War reenactment.
C.S.I. has used Civil War reenactments as a backdrop for plotlines, too, at least twice, if I recall correctly.