Saturday marks the fourth anniversary of Hekmati's imprisonment on what Kerry called "false espionage charges" while Hekmati was visiting relatives in the Islamic republic.
"We repeat our call on the Iranian government to release Amir on humanitarian grounds," Kerry said in a statement.
"This is a milestone no family wants to mark, and the Hekmati family has shown inspiring perseverance in the face of this injustice," he added.
"And as befits a former Marine, Amir has shown tremendous courage in the face of this unjust detention."
These include pastor Saeed Abedini, who was arrested in 2012 and sentenced to eight years in jail for gathering a group of people to study the Bible, and Washington Post reporter Jason Rezaian.
Kerry also urged Iran to "work cooperatively" to help locate Robert Levinson, a former FBI agent who disappeared while on Iran's Kish island in 2007.
Several lawmakers and Republican presidential candidates have argued that Washington and the international community should have negotiated the return of the Americans as a condition for finalising the historic nuclear deal with Iran.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
