DES MOINES — There was enough evidence for a jury to conclude in a wrongful-death lawsuit that an Iowa man shot and killed his mother, the state Supreme Court ruled Friday, leaving in place the jury’s $10 million award even though the man was eventually acquitted on criminal charges in her death.The court denied Jason Carter’s appeal of the civil judgment, in which a jury found him responsible for the June 2015 shooting of his mother, Shirley Carter, at her home near Knoxville.Jason Carter, of Knoxville, and his father, Bill Carter, have been locked in legal disputes since Shirley Carter’s death.Bill Carter, an agent with the Iowa Division of Criminal Investigation, filed the lawsuit on behalf of his late wife’s estate and another son, Billy Dean Carter, in 2016.