An energy policy that was challenged by the lawsuit was repealed in March by the state Legislature, and Montana's attorney general wanted that part of the case dismissed.
The skeleton was built from specimens retrieved from three sites in the Hell Creek and Lance Creek formations of Montana and Wyoming between 2008 and 2013.
A Wyoming man who died after being life-flighted to a Montana hospital following a two-vehicle collision in Cody may have had a medical condition before the crash.