Turkish authorities have detained a woman on suspicion of shooting dead in Istanbul one of the country's most prominent writers of self-help popular psychology books, reports said on Saturday. Beki Ikala Erikli, 48, was murdered late on Thursday at her apartment building by an attacker who fired three bullets into her at close range. A woman named Sinem Koc, 31, was late on Friday detained on suspicion of the murder, the Hurriyet and Sabah dailies said. The suspected weapon was also found. Istanbul's Jewish newspaper Salom said Erikli was a member of the city's small Jewish community.