James Crumbley, the father of the convicted Oxford High School shooter, was found guilty on Thursday of involuntary manslaughter.

Why it matters: Crumbley and the gunman's mother are the first parents in the U.S. to be held criminally responsible for a mass shooting committed by their child.

• The maximum penalty for involuntary manslaughter in Michigan is 15 years in prison.

Context: Ethan Crumbley killed four students and wounded seven others in a 2021 shooting in Oakland County, Michigan.

• He was sentenced to life in prison last December after pleading guilty to 24 charges, including four counts of first-degree murder and one terrorism related count.
• Prosecutors said his parents made a gun available to their son and ignored his mental health needs leading up to the shooting.

His mother, Jennifer Crumbley, was convicted of involuntary manslaughter in February.

• Both parents were in jail for over two years while awaiting trial because they could not afford bond.
• They both pleaded not guilty to four counts of involuntary manslaughter in 2021 and requested separate trials.

Go deeper: Michigan school shooter's mother found guilty of involuntary manslaughter