CEDAR RAPIDS – A Mason City woman who illegally possessed a sawed-off shotgun and shared multiple guns with her husband, a convicted felon who was prohibited from possessing firearms, was sentenced March 14, 2025, to 42 months’ imprisonment.
Sarah Kay Johnson, age 38, from Mason City, Iowa, received the prison term after an October 17, 2024 guilty plea to possession of a national firearms destructive device not registered to possessor.
In October 2023, law enforcement officers traffic stopped Ian Jon Duffy, Johnson’s then boyfriend, due to concerns about his wellbeing. At that time, he possessed multiple loaded firearms. Duffy had a prior domestic abuse conviction which prohibited him from possessing firearms. After the traffic stop, Duffy had Johnson obtain a Glock handgun for him. At this time, Duffy was also prohibited from possessing a firearm due to a felony conviction. Johnson obtained several firearms that she shared with Duffy in their residence, including a sawed-off shotgun.
Johnson was sentenced in Cedar Rapids by United States District Court Chief Judge C.J. Williams. Johnson was sentenced to 42 months’ imprisonment. She must also serve a three-year term of supervised release after the prison term. There is no parole in the federal system.
The case was prosecuted by Assistant United States Attorney Nicole L. Nagin, and it was investigated by the Bureau of Alcohol, Tobacco, Firearms and Explosives, the Federal Bureau of Investigation, the Waterloo Police Department, and the Cedar Falls Police Department.
This case is part of Project Safe Neighborhoods (PSN), a program bringing together all levels of law enforcement and the communities they serve to reduce violent crime and gun violence, and to make our neighborhoods safer for everyone. On May 26, 2021, the Department launched a violent crime reduction strategy strengthening PSN based on these core principles: fostering trust and legitimacy in our communities, supporting community-based organizations that help prevent violence from occurring in the first place, setting focused and strategic enforcement priorities, and measuring the results.