The actor, who famously starred in a string of hit martial arts movies, was also the father of Arrow actress Celina Jade.
According to Variety, the actor died on October 12 after hiking and meditating in the hills near Los Angeles.
Horan, also known as ‘Sandy’ and sometimes credited as Roy Haron, was a film executive whose martial arts career flourished in Hong Kong’s Golden Era.
In 1975, Horan starred in Bruce Lee’s Deadly Kung Fu, and went on to appear in Snuff Bottle Connection and The Ring of Death.
The actor also played the evil Russian Assassin disguised as a Jesuit priest in Jackie Chan’s Snake in the Eagle’s Shadow in 1978.
He also directed the video series The Art of High Impact Kicking, before his final acting role in 1987 in No Retreat, No Surrender 2.
Following his acting career, Horan was an executive-in-charge of distribution, sales, marketing and international production for Seasonal Film Corporation in Hong Kong.
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The actor is survived by seven siblings as well as Asia-based children, Celina ‘Jade’ Horan and Jillian Horan.
Jade’s credits include The Man With the Iron Fists, My People My Homeland and Hello, Mrs Money. Elsewhere, she played Shado in CW series, Arrow.
A memorial ceremony is being held today in Los Angeles.