FLINT, MI - Testimony is set to resume this morning in the case accusing Michigan's health chief of involuntary manslaughter in relation to Flint's water contamination crisis.

The second day of preliminary exam for Michigan Department of Health and Human Services Director Nick Lyon is scheduled to resume at 9:30 a.m. on Friday, Sept. 22, before Genesee District Judge David Goggins.

Follow along in the comments for updates from Friday's testimony. Join in the debate in the comments or on Twitter by using #WaterHearing.

Lyon is charged with involuntary manslaughter and misconduct in office. It's the first criminal water crisis case to advance to a preliminary exam.

During the first day of testimony in a packed Genesee County District courtroom on Thursday, Sept. 21, the court heard testimony from the man who served as second-in-command to Lyon at the MDHHS, and from the infectious disease specialist investigating a Legionnaires' outbreak in Flint's water.

Tim Becker, who served as the MDHHS deputy director from Oct. 2014 to July 2016, testified he began discussing possible legionella bacteria in Flint's water system in January 2015 - nine months before the city switched its water source back from the corrosive Flint River water to the Great Lakes Water Authority.

The court also heard from Dr. Marcus Zervos - the head of Henry Ford Hospital's Infectious Diseases division and co-principal investigator of Wayne State University's study of Flint's water contamination crisis.

Zervos testified that a legionella outbreak may have played a role in more than the 12 deaths the state originally reported.

Chip Chamberlain, Lyon's defense attorney, is expected to cross-examine the disease specialist first-thing on Friday.