Jim Steinman has died aged 73, according to Connecticut's state medical examiner.
Jim was renowned for his songwriting and produced huge hits for Meat Loaf, Celine Dion and Bonnie Tyler, among a host of others.
TMZ has reported that the cause of death is unclear but it is thought to have been sudden.
The US site reported that there was a medical emergency call to his home around 3.30am on Sunday..
Jim is probably best known for writing Meat Loaf's Bat Out of Hell album, which has gone on to be one of the biggest selling of all time.
He also wrote the follow-up, Bat Out of Hell II: Back into Hell, as well as writing and producing the smash hit, I'd Do Anything For Love (But I Won't Do That).
It wasn't just Meat Loaf that Jim produced huge hits for as he worked his magic with Bonnie Tyler's albums, writing and producing her biggest hit, Total Eclipse of the Heart.
Air Supply also benefitted from the Steinman touch as he wrote and composed their renowned hit, Making Love Out of Nothing at All.
The master of the power ballad also worked with Barry Manilow, giving him Read 'Em and Weep, which he had originally written for Meat Loaf.
Jim previously opened up about the inspiration for the lyrics behind Celine Dion's It's All Coming Back To Me Now, which was first recorded by Pandora's Box.
On his website, he wrote: "I was trying to write a song about dead things coming to life. I was trying to write a song about being enslaved and obsessed by love, not just enchanted and happy with it.
"It was about the dark side of love and about the extraordinary ability to be resurrected by it once dead."
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