There are many different answers.
But the most common in the press and web pages are that he died from an overdose
in other words:
he took too much drugs at one time.
It was a great loss
The dog I associate with Mr. King is Cujo.
nothing
"Cujo" from the Stephen King movie of that name, was a St. Bernard.
symbolism
They die at the age of 42 and some even die at 65!
Alfred Gatley died in 1863.
Alfred Gatley was born in 1816.
Gatley railway station was created in 1909.
Stephen Dartnell died in 1994.
Stephen Mueller died in 2011.
Stephen Botting died in 1927.
Stephen Kocisko died in 1995.
Stephen Verney died in 2009.
Stephen Varzaly died in 1957.
Stephen College died in 1681.
Stephen Sanford died in 1913.
Stephen Morin died in 1985.