Expressing condolence over Shukla's demise Chief Minister Raman Singh declared the three-day mourning in the state.
Flags will fly at half-mast on all government buildings and no official function will be held during this period.
Shukla (84) died in a Gurgaon hospital this afternoon after battling injuries sustained in the deadly Naxal attack on a convoy of party leaders in Bastar on May 25.
Shukla was airlifted from Raipur and admitted to the hospital on May 26, a day after the attack which eliminated almost the entire top leadership of Chhattisgarh unit of Congress.