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Kejriwal was arrested by the ED on March 21, hours after the Delhi HC refused to grant him protection from coercive action by the federal anti-money laundering agency. He is currently lodged in Tihar jail.
The CBI produced her before the court on expiry of the three-day police custody.
Kavitha, 46, was arrested from her Banjara Hills residence on Friday amid protests by Bharat Rashtra Samithi (BRS) supporters.
Fifth convict Ajay Sethi was sentenced to three years in jail.
The Malayali journalist was shot dead on Sept 30, 2008, while she was returning home from work in her car around 3.30 am. Police had claimed that the motive behind her killing was robbery.
The accused allegedly urinated on an elderly woman co-passenger on an Air India flight on Nov 26.
Chief Metropolitan Magistrate Snigdha Sarvaria allowed the police plea, which said further investigation was on.