BJP's B S Yediyurappa was sworn-in as the Karnataka Chief Minister for 4th time Friday evening, three days after the collapse of H D Kumaraswamy-led Congress-JD(S) government in a trust motion. Governor Vajubhai Vala administered him the oath of office and secrecy around 6:30 pm on Friday.Yediyurappa had earlier today staked claim and requested the Governor to be sworn-in Friday evening itself.