The film which also marks the directorial debut of casting director Mukesh Chhabra, is a remake of the popular Hollywood film The Fault in Our Stars.
Rajput was found dead at his residence on Sunday morning and an investigation is ongoing, a spokesperson for the Mumbai police said, declining to give further details.
"Shocked and saddened to hear about the death of #SushantSinghRajput Condolences to his family and friends".
Rajput was last seen in "Chhichhore" alongside Shraddha Kapoor.
His last social media post, dedicated to his late mother who died in 2002 when he was a young teen, was on June 3.
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I would say any insinuation that I was trying to mock the Black Lives Matter movement is an attack on my character and really sad. He said Pearman was telling him not to use the term regarding one of his teammates when he uttered the pejorative word.
He wrote: "Blurred past evaporating from teardrops". Media outlets and police suspect that the 28-year-old celebrity manager also killed himself.
"It's such devastating news. May your soul rest in peace".
Back home in Patna, as crowds gathered outside Rajput's father's home, Laxmi, the caretaker, told mediapersons that the actor's eldest sister who lives in Chandigarh would be flying in to accompany their father to Mumbai.
Without revealing name of the girl, he said that the family was gearing up for the wedding.
As the news of Sushant's sudden death surfaced online, his fans, followers, friends, and co-stars from the industry expressed their deep shock and pain.
He was known for his portrayals in TV serials like "Pavitra Rishta", films "Kai Po Chhe", "Shuddh Desi Romance", the biopic "M.S. Dhoni: The Untold Story", "Kedarnath" and "Chhichore", among several others. Expressing shock at his death, the prime minister said Rajput's rise in the world of entertainment inspired many and he leaves behind several memorable performances.