Understanding Child Endangerment - Baby left alone in car

IIRC, that case was for manslaughter, but the court briefly addressed the alternate theory of endangerment and quickly wrote that theory off due to a lack of criminal negligence.

Not exactly. They said that the level of negligence for child endangerment was not the same as that required for manslaughter:

(Quick translation: the AG argues that even if she didn’t have any criminal negligence, she did violate the endangerment statute. And violating the endangerment statute should count as “an unlawful act” that causes a death within the meaning of the manslaughter statute.

So an act may be negligent enough to violate the child endangerment statute, but not negligent or reckless within the meaning of the manslaughter statute. The court doesn’t address whether or not she actually violated the endangerment statute; they just say that even if she did, it doesn’t make a resulting death manslaughter.

Ah, thanks. That’ll teach me not to skim.