Former Uttar Pradesh minister Amarmani Tripathi, remanded to a week's police custody in the Madhumita Shukla murder case, was on Wednesday brought to Delhi for questioning by the Central Bureau of Investigation, agency sources said.

He is likely to undergo a lie detector test, the sources added.

Tripathi was arrested on Sunday and remanded to seven days' police custody by a special judicial magistrate in Lucknow.

He is the key accused in the murder of the young poetess in Lucknow on May 9.

The special magistrate had directed that Tripathi be taken for a medical examination before being handed over to CBI.