Mass shooters have "a slow build towards violence over time and they give up a lot of warning signs," a forensic psychologist testified Friday at a pretrial hearing for the parents of the Michigan school shooter suspect. James (left) and Jennifer Crumbley are seen here in a split image.
Mandatory Credit: Oakland County Sheriff's Office
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Prosecutors seek to introduce evidence Michigan school shooter's parents created a pathway to violence
Mass shooters have "a slow build towards violence over time and they give up a lot of warning signs," a forensic psychologist testified Friday at a pretrial hearing for the parents of Michigan school shooter suspect Ethan Crumbley.
