Shimla, May 27 -- HPPCL chief engineer Vimal Negi's wife Kiran Negi on Monday wrote a letter to chief minister Sukhvinder Singh Sukhu over what she said was delay in handing over the probe to CBI. "The court explicitly directed the state government to immediately transfer the case to CBI for fair and impartial investigation... the state government has not yet taken necessary steps to transfer the case of the CBI," read the letter which has been accessed by HT....