After doctors allowed Pakistan Tehreek Insaf chief Imran Khan to travel, cricket turned politician reached Islamabad.
After landing at Benazir International Airport, Khan visited family of Usman Mirza', the PTI worker who was shot dead during election campaign in Rawalpindi.
Imran offered Fateha for deceased worker and conveyed his sympathies and condolence to victim's family.
Later talking to media Imran Khan said the murderer of Usman Mirza must be brought to book vowed to continue his struggle until killers are arrested and punished.
PTI chairman said he kept Rawalpindi seat just because of Usman Mirza to give him honour and obliged deceased worker.
Khan said it was his first ever visit after recovery of his injuries which reflects his concern for deceased Usman Mirza.
He said whole family was dependent on Usman Mirza and his wife was pregnant when he was shot dead in Rawalpindi.
Imran Khan is likely to attend the next National Assembly session to take oath of his National Assembly membership in the house.
Khan has not taken oath as member of the national assembly even after winning three seats of the national assembly from Mianwali, Peshawar and Rawalpindi. It is expected that he will take oath as the member keeping his Rawalpindi seat intact.
He was admitted in the Shaukat Khanam Hospital after falling from a lifter in election-related activity in Lahore last month. He had sustained head and back injuries.