Manslaughter probably needs some element of reckless, and I don’t know if 71 in a 55 is reckless. Sometimes, it takes 20 over the speed limit for reckless driving, that lack of reckless element kept the grand jury from indicting. Bad judgment all around, however. Painful and enduring lessons for those left living.
Tell you what. Drive down a city residential street at 41 mph in a 25 zone, strike and kill a kid playing in the street, and see if you get charged with manslaughter or negligent homicide! 16 mph over the posted speed limit is not a small difference.