The video of the execution in the eastern city of Derna was posted on social media websites, including YouTube.
Amnesty International said it was carried out on August 19, apparently by an extremist militant group,the Shura Council of Islamic Youth, in front of a crowd seated in the stadium.
"This unlawful killing realises the greatest fears of ordinary Libyans, who in parts of the country find themselves caught between ruthless armed groups and a failed state," said Hassiba Hadj Sahraoui, Amnesty International's Middle East and North Africa Deputy Director.
"The Libyan authorities, with the support of the international community, must urgently address the breakdown of law and order that has persisted in Derna and elsewhere following the end of Colonel Kadhafi's rule."
In the video, the Egyptian, named as Mohamed Ahmed Mohamed, is brought into the stadium blindfolded on a truck.
He is forced to kneel and a statement is read out accusing him of killing a Libyan, Amnesty said.
Since the fall of long-time dictator Moamer Kadhafi in a NATO-backed 2011 uprising, interim authorities have failed to establish order and security in a country prone to anarchy and deadly violence.
They have been unable to restrain a large number of militias formed by ex-rebels who fought Kadhafi and who still hold sway across Libya.
Since mid-July, Libya has been rocked by fierce and deadly fighting between militias that has prompted an exodus of foreign nationals from the oil-rich North African country.
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
