That's what CNN is reporting:
https://www.washingtonpost.com/news...o-traffic-is-captured/?utm_term=.8919f5a44d81
But 1st and 3rd degree charges sounds screwy to me too - never went down in the jurisdiction where I served.
I looked it up and got this:
Voluntary manslaughter: (also referred to as third-degree murder), sometimes called a crime of passion murder, is any intentional killing that involves no prior intent to kill, and which was committed under such circumstances that would "cause a reasonable person to become emotionally or mentally disturbed".
I suppose it could result from an unintentional, spontaneous murder. Maybe that does fit road rage best. Spur of the moment.