Criminal negligence resulting in death is a summary of (the applicable) Michigan’s statutory definition of involuntary manslaughter.
Most often applied in DUI cases, where there is a death. Without a death, it (can be) criminal negligence. Same for a sober person racing on the sidewalk in the wee hours - nobody there, but man, that is criminally negligent/reckless.
I am more concerned about the 15 years thing.