"shot twice in the back near his tree stand on family land"
Sounds pretty familiar, eh? I read here earlier today on a ping/post from you the bullets weren't found from the prior killing. I'd bet money it was Vang.
No reason for him to confess to it, unless he wished to cleanse his soul. Oh, wait a minute...what was I thinking...?
Thanks for the ping, ButThreeLeftsDo.
If he committed the Clark County murder, he might confess to get a prison cell closer to his family. He has something to gain and nothing to lose.