Although her death was not premeditated, nor was she killed in the heat of passion, she was killed with a lack of concern for human life. (Gardner 2012)
If Jim had killed his wife at the same time as the mailman, he could be charged with Voluntary Manslaughter for the death of his wife and the mailman. However, instead he killed the mailman and took a lunch break before deciding to murder his wife. It is this brief moment of time that separates the charge of Second Degree Murder and Voluntary Manslaughter. Jim had the time to calm down and to rationalize his emotions, but still chose to commit manslaughter due to the resentment he felt towards his wife.
Jim Aiken should be charged with Second Degree Murder and Voluntary Manslaughter. He should face fifteen years to life for Second Degree Murder and an additional three to eleven years for Voluntary Manslaughter.