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 detained late yesterday on suspicion of the murder, the Hurriyet and Sabah dailies said. The suspected weapon was also found.
Istanbul's Jewish weekly newspaper Salom said Erikli was a member of the city's small Jewish community. But there is currently no suggestion of any ethnic or religious motive to the killing.
Erikli was especially known for a hugely popular self-help book named "Living with the Angels".
On social media, she described herself as an "author and spiritual teacher devoted to enabling everyone to connect to their inner voice, intuition, or angels.
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