A civil lawsuit is alleging former Senate President Stan Rosenberg knew his estranged husband Bryon Hefner posed a risk to individuals at the Massachusetts Statehouse and Rosenberg and Hefner had an agreement or understanding allowing Hefner access to those individuals.
The lawsuit, which names both men, was filed in Suffolk Superior Court Friday on behalf of an unnamed plaintiff who alleges Hefner grabbed his genitals without consent.
The lawsuit alleges Rosenberg knew the risk Hefner posed and had "a common design or understanding" with Hefner allowing the unwanted sexual touching to happen.
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The suit alleges the plaintiff suffers emotional distress.
Attempts to reach Rosenberg, who resigned in May, were unsuccessful.
Hefner has pleaded not guilty to criminal charges including sexual assault. Hefner's lawyer didn't immediately return a request for comment.