Farmer was irate about his wife's affair and feared he would lose their hog farm if she divorced him, prosecutors said.
Survivors said that after taking what they believed to be cocaine, "people immediately began to drop," according to a statement from officials.
The temblor, which was felt across the island, was the strongest to hit the island in recent years.
Charles Anderson, who had been with the Muskegon Police Department for more than two decades, denied ever being a Ku Klux Klan member or supporter.
Bystanders on the platform recorded cellphone video of people who jumped down to help rescue the 5-year-old and lift her back to safety.