Seif al-Islam Gadhafi was shot dead after armed men stormed his residence in Zintan, western Libya, amid renewed political tensions in the country.
Libyan authorities have launched an investigation, confirming he died from gunshot wounds, while forensic teams search for suspects and interview witnesses.
The killing has political implications, as Seif al-Islam had been seeking a return to public life, prompting speculation about militia involvement, which groups linked to the Tripoli-based government have denied.