It turns out that in Michigan there is no obligation to render aid, even to call for help. At least, according to the City of Detroit.
QuoteDetroit police Chief James Craig had a warning recently for those who watched or videotaped two fights that drew wide attention online: "If you're videotaping, as far as I'm concerned, you're an actor in this."
He went further: "Unless you take overt steps to assist us, like calling 911 ... you can't just sit back and watch violent crime being committed."
But Michigan has no such law forcing a call to 911 or taking action when they see a crime being committed, and experts, including defense attorneys, local law enforcement and even the Detroit Police Department admit there's no legal basis for such charges. Michiganians have no legal obligation to assist in a police investigation or even to call police. And the presence of a camera phone, and uploading the incident online, doesn't change that.
http://www.detroitnews.com/story/news/local/detroit-city/2017/04/23/bystanders-charged/100814268/
They're wrong: Recording such incident that develops into a felony (Murder, manslaughter maiming etc) and said recording becomes material evidence