Milton resident Bernard Sigh, who was married to the sister of former Massachusetts Gov. Deval Patrick, was found guilty of rape, stalking, kidnapping, witness intimidation and other offenses by a Norfolk Superior Court Jury on Thursday.
Sigh was arrested in June 2018 for raping a woman, and then continuing to stalk and harass her.
Sigh and Patrick's sister chose to end their marriage in 2017, according to the Boston Globe.
Sigh will be sentenced on June 24. He faces a maximum sentence of 20 years in state prison for the rape conviction and a mandatory minimum sentence of one year for the conviction on stalking in violation of a protective order.
"Despite the added pressure surrounding this case, among other barriers, this victim demonstrated great courage and resolve in pushing through to today's resolution," Norfolk County District Attorney Michael W. Morrissey said in a statement. "Not every sexual assault or domestic violence victim is positioned to endure the burdens our system places on them — this victim deserves our support and gratitude."
The relationship between Sigh and the former governor made news in 2014.
Patrick, who was still in office, fired the head of the state's Sex Offender Registry Board in part because she questioned why Sigh wasn't required to register for a 1993 spousal rape conviction in California.
The Associated Press contributed to this report.
This article has been updated to reflect that Sigh will be sentenced on June 24, not June 14.