The body of Sehrai, 77, was handed over to his family on Wednesday evening and taken in a police escort to Kupwara in north Kashmir, at least 350 km from Jammu, where he would be buried at his ancestral graveyard in accordance with the COVID-19 guidelines.
Abdul Gani Dar was shot at three times from a close range with an AK assault rifle, he said, adding two bullets hit him in the chest and one in the shoulder.
However, it was not clear on what basis most of the people were being held.
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The leaders from Jammu and Kashmir's political parties were placed under detention following the abrogation of Article 370 by the Centre on August 5.
The PDP and the NC condemned the killing of the special police officer.
The latest developments from the violence-hit valley.
"Trust is something that has been missing from both sides (Delhi and Srinagar). Successive prime ministers -- Jawaharlal Nehru, Narasimha Rao, Atal Bihari Vajpayee -- made promises but the trust deficit has persisted," he added.
The former Jammu and Kashmir chief minister said such efforts have lost credibility as there has hardly been any follow-up after similar visits in the past.