Leading leftist opposition leader Chokri Belaid was shot dead on Wednesday morning as he left his home in Tunis, said his family, which accused Tunisia's ruling Ennahda party of being behind the killing.
Belaid was head of the opposition Democratic Patriots party and a harsh critic of Tunisia's Islamist-led government.
"I accuse ... (Ennahda leader) Rached Ghannouchi of assassinating my brother," Abdelmajid Belaid, brother of the dead leader, told AFP. "My brother was assassinated. I am desperate and depressed," he added.
The wife of the opposition leader, speaking to Radio Mosaique, said he had been hit by two bullets as he left his home.
Belaid's party was part of a coalition of parties which has emerged in opposition to the Tunisia government.
Rise in violence
The country is witnessing a rise in violence fed by political and social discontent more than two years after the toppling of the former dictator Zine El Abidine Ben Ali.
Several opposition parties and trade unions have accused the pro-Islamists of orchestrating clashes or attacks against them.AFP