Bollywood celebs mourned his death on Twitter:
Vikas Mohan yesterday , Razzak Khan today .. We are losing a lot of good people. Hope the families find strength in these times.? Anurag Kashyap (@anuragkashyap72) June 1, 2016
Funny man Razak Khan has also passed away. May his soul rest in peace...? Arshad Warsi (@ArshadWarsi) June 1, 2016
Such sad news. Great memories of acting and spending time with him. RIP Razzak Bhai. https://t.co/MFtu722KkY? Gaurav Kapur (@gauravkapur) June 1, 2016
RIP Razzak Khan. The man for whom i composed my first Hindi song. The unreleased Saluun, where he played @gauravkapur's dad. His best.? Soumik Sen (@bangdu) June 1, 2016
Sad to hear about passing away of Razzak Khan. His finest performance in 'Dubai Return' with @irrfan_k unfortunately remains in the cans.? Hansal Mehta (@mehtahansal) June 1, 2016
R I P. Razak Khan,a colleague of many a film. Condolences to all concerned! pic.twitter.com/5QXYVYBN4M? Rishi Kapoor (@chintskap) June 1, 2016
Saddened to hear of the sudden demise of co actor & good friend #RazakKhan! Our 'Popat' laundry guy from the KKHH series will be missed!RIP? Tusshar (@TusshKapoor) June 1, 2016
Razak Khan has featured in films like Roop Ki Rani Choron Ka Raja, Raja Hindustani, Pyaar Kiya To Darna Kya and Baat Bann Gayi.
Mr Khan was last seen in Kyaa Kool Hain Hum 3.
In 2012, Mr Khan also had a cameo in television show RK Laxman Ki Duniya.