Bollywood superstar Sridevi Kapoor died of accidental drowning in Dubai, the city's police department said on Monday.
The post-mortem report showed that the actress died due to drowning in her hotel apartment's bathtub after she lost consciousness.
The 54-year-old actress, known simply as Sridevi, died on Saturday. The cause was initially reported to be cardiac arrest.
Sridevi was in Dubai to attend a family wedding.
The actresses' shock death has left the Indian film industry and millions of fans in India and around the world heartbroken.
Dubai police said that the case has been transferred to the public prosecution, which will carry out the necessary legal procedures.
Sridevi's body was expected to arrive in Mumbai later on Monday. The cremation is likely to take place on Tuesday.
Sridevi featured in Tamil, Telugu, Malayalam and Kannada language films before making her debut in Bollywood in 1978.
She was a recipient of the Padma Shri, one of India's highest civilian awards.
Sridevi was married to film producer Boney Kapoor with whom she had two daughters.
AFP adds: Hundreds of heartbroken fans gathered outside Sridevi's Mumbai home hoping to catch a final glimpse of the star before her cremation, now likely to take place on Tuesday at the earliest.
"The death of Indian actress Sridevi occurred due to drowning in her hotel apartment's bathtub following loss of consciousness," Dubai police tweeted, citing an autopsy report.
Police have now referred the case to the public prosecutor.
People gather outside the residence of Sridevi Kapoor in Mumbai on Monday.
Tributes kept pouring in for the actress and fans gathered outside her home for a second day.
"We want to see her one last time," 48-year-old Laxmi Subbaramaiah told AFP outside the house in the Andheri area of Mumbai -- the heartland of the Bollywood film industry.
"All of my family members are big fans and we cried when we heard the news. We will wait here until her body comes back," he said.
Vishal More, 23, said he had travelled seven hours from Jalgaon district, around 400 kilometres away from Mumbai, to bid farewell to his favourite actress.
"I've been waiting all morning to catch a last glimpse of Sridevi. I have watched all of her movies. She is such an inspiration," he said.
Sridevi's death has prompted an outpouring of grief in India from fans and fellow actors as well as condolences from Prime Minister Narendra Modi.
"I have always been a huge fan of her work. Equally I have been an admirer of the grace and dignity with which she conducted herself," actor Aamir Khan wrote on Twitter.
"I join all the millions of her fans in mourning her demise. Ma'am we will always remember you with love and respect," he added.
Fellow actor Ranveer Singh tweeted that he was "shocked and saddened to hear about the untimely demise of one of Hindi cinema's greatest superstars".
Actress Alia Bhatt posted on Twitter: "Nothing makes sense. I have no words... just completely shocked. RIP Sri Devi. My icon forever. Love you."
Sridevi, born Shree Amma Yanger Ayappan in the southern state of Tamil Nadu, appeared in around 300 films and was awarded the Padma Shri, India's fourth highest civilian award, for services to the movie industry.
She made her acting debut at the age of four and her career spanned more than four decades.
Sridevi worked in India's regional Tamil, Telugu and Malayalam-language films before making her Bollywood debut.
She became a national icon with a string of blockbuster films including Chandni, Mr India, Mawali and Tohfa.
Sridevi famously took a 15-year-break from the silver screen after marrying film producer Boney Kapoor but returned in the 2012 hit comedy-drama English Vinglish. Her most recent film was last year's Mom.
She was set to see Jhanvi, the eldest of her two daughters, make her Bollywood debut.
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