The horror icon's wife,Suzie, shared the news Monday on Sid's own social media account, writing ... "On Saturday, September 21, 2019, my light, my heart, my true love, my King, the other half of my soul, Sidney, passed from this realm on to the next."
She went on to say, "He has returned to the Universe, a shining star in her heavens. He was my angel, my husband, my best friend and always will be." Suzie added, "He adored his family, his friends and his fans. This came as a shock to all of us. We, as a family, are asking that our privacy and time to mourn be respected."
Sid had recently been hospitalized and transferred to the ICU after he was involved in some sort of accident -- this per screenshots of his IG account, which was apparently run by his wife. On Sept. 6, she was asking for prayers.
Sid's rep would only tell TMZ that the accident was something that took place at his home.