Parents of Michigan teen in school shooting charged with manslaughter

James Crumbley brought Ethan along with him when he purchased the handgun used in the attack four days prior, McDonald said.

Parents are rarely charged in connection with children's school shootings. Unlike some states, Michigan does not legally require gun owners to keep their firearms secured from children.

The attack was the deadliest school shooting this year, according to Education Week, and marks the latest in a decades-long string of mass shootings at U.S. schools.