70-year-old Khanna died of bladder cancer at a hospital in Mumbai today.
As the news of his death spread, his constituency went into a state of mourning.
"The news has come as a great shock to us. We cannot believe that he is no more. He was ever so helpful and did so much for his constituency," 78-year-old Jarnail Singh, a Pathankot-based resident in Gurdaspur Lok Sabha constituency, said.
Suave and easy to mingle with voters, Khanna was always a crowd puller in his constituency. He even bought a house in the region so that he could have easy access to the people of his constituency.
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After joining the BJP in 1997, Khanna was fielded from Gurdaspur parliamentary seat in 1998. He met the expectations of the saffron party when he unseated veteran Congress leader and five-time MP Sukhbuns Kaur Bhinder with a handsome margin.
Khanna, who appeared in over 140 films, including "Haath ki Safai", "Hera Pheri" and "Muqaddar Ka Sikander", again trounced Bhinder in 1999 and 2004 Lok Sabha polls.
However, he had to taste defeat in 2009 Lok Sabha elections when he was defeated by Congress candidate Partap Singh Bajwa.
Khanna, who became a disciple of Osho in the late 1970s, had also come under severe criticism by his political opponents as they dubbed him as "Mumbai Ka Babu" and an "outsider".
The veteran actor is survived by his wife, Kavita Khanna, and four children - Rahul, Akshaye, Sakshi, and Shraddha.
He had always said that he considered his constituency as his fifth child.
"Gurdaspur constituency is my child. In fact, it is my fifth child which needs my attention the most," he had said during poll campaigning for the 2014 Lok Sabha polls.
"He got several bridges built on Ravi, Beas and Ujh rivers. These bridges helped in connecting several villages located at far off places with the city and as a result of which Gurdaspur got developed," said his close aide Samarinder Sharma.
"He also got a Railway shunting yard removed from Pathankot which helped in resolving the traffic problem in the area. The leader also helped in setting up the domestic airport at Pathankot," he said.
"Khanna ji last visited the constituency in December. He could not visit further due to his failing helath," he said.
The veteran actor had even come under attack from opposition parties for not being present in his constituency at the time of the terror attack at Pathankot air force base station last year.