Nick Lyon, the head of Michigan's health department, was charged with involuntary manslaughter today for his role in the Flint water contamination scandal, becoming the highest-ranking state official to be charged thus far, per the AP.

The accusation: Lyon didn't tell the public about an outbreak of Legionnaire's disease, a bacterial pneumonia often linked with poor water quality, in Flint at the time of its water crisis.

Refresh your memory: The city of Flint changed its water source to the Flint River in 2014. The high levels of chemicals in the untreated water caused lead from plumbing systems to leach into the water supply.