One of Moammar Gadhafi's sons was sentenced to death on Tuesday over killings during the country's 2011 uprising.
Seif al-Islam was convicted of suppressing peaceful protests during the revolution that ended his father's rule.
In a televised session, the Tripoli court also handed a death sentence by firing squad to Gadhafi's former spy chief, Abdullah al-Senoussi, and his former prime minister, Baghdadi al-Mahmoudi.
The verdict on al-Islam was passed in absentia since he has been held since 2011 by a former rebel group in Zintan region that opposes the Tripoli government, which is not recognized by world powers.
Five others were also sentenced to death on Tuesday.