<h1>Party challenges special investigation team in stampede probe; defamation notice to actor and streamer; deputy arrested over singer's death</h1> A political party has moved the Supreme Court challenging a High Court order that constituted a special investigation team to probe a deadly stampede, with the apex court agreeing to hear the petition. Separately, a High Court has issued notice to an actor, a production company and a streaming platform in a defamation suit filed by a tax department officer alleging reputational damage from a web series. In another development, a state police deputy superintendent was arrested in connection with the overseas death of a prominent singer, triggering a criminal investigation.