Ahmed is the ninth journalist killed in Mogadishu since 2007, Ali Yasin Gedi, the vice-chairman of a local rights group, said.
Reporters are frequently abducted by armed men in Somalia where there has not been an effective central government since 1991.
A journalist working for another independent radio station was killed in Afgoye, a town near the Somali capital, on January 1.
Sheikh Sharif Ahmed, who was sworn in as Somalia's president last week, has pledged to combat violence and bring stability to the country.