Mumbai, Sep 2 : The Indian showbiz industry woke up to the shocking news of actor Sidharth Shukla's death on Thursday. Colleagues and friends expressed their grief on Twitter. Sidharth was 40. The actor passed away in Mumbai's Cooper Hospital after suffering a massive heart attack in the morning. Actor and comedian Sunil Grover tweeted: "Shocked and sad to know about Sidharth Shukla. Gone too soon. Prayers. Rest in peace.". Actor R. Madhavan wrote: "Heartbreaking and tragic. Rest In Peace brother. Just don't have words to express my anguish." Actor Aftab Shivdasani tweeted: "Extremely sad and shocking news of the passing of #SiddharthShukla, life is so so fragile. My deepest condolences to his family in this heartbreaking time. Prayers for his soul. Om Shanti." Actor Kushal Tandon uploaded a picture with Sidharth and tweeted: "Sad, shocking, May God gives strength to his mother, sister and family, RIP brother fly away into different world peacefully Om Shanti." Director Hansal Mehta, pointed out how young he was. He tweeted: "No age to have a heart attack. No age to go. This is extremely sad and disturbing. Hope this time for sadness, reflection and mourning does not get converted into a Tamasha by some idiots." Actress Koena Mitra said: "Deeply saddened! @sidharth shukla , We met for just 14 days, we fought a lot and parted ways. Never spoke again. Your sudden demise has taught me unconditional forgiveness! I forgive everyone & seek forgiveness from whoever I may have disappointed. RIP Sid. #SiddharthShukla" Sidharth is survived by his mother and two sisters. /IANS