Jharkhand Chief Secretary D KTiwari retired on Tuesday after serving for 34 years.Tiwari will be succeeded by Sukhdev Singh, an official statement said.Chief Minister Hemant Soren and other senior officials felicitated Tiwari, a 1986-batch IAS officer.Your role in the all-round development of Jharkhand has been important. You discharged your responsibilities with commitment and dedication, Soren said after presenting Tiwari with a shawl and a memento.