Tyler Christopher died under sad circumstances — according to officials, he suffocated to death … and it appears to have been partially caused by him being drunk.

According to the Medical Examiner Office’s report, obtained by TMZ, the “General Hospital” star’s official cause of death is being listed as positional asphyxia due to acute alcohol intoxication. There’s a contributing condition cited … coronary artery atherosclerosis.

In layman’s terms, Tyler suffocated to death because of how he was positioned when he died — and the ME here is saying booze played in a part in him ending up that way. The latter description is basically plaque build-up in his arteries. His death was accidental.

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We broke the story … Tyler’s friend found him deceased at his San Diego apartment — this after trying and failing to get a hold of him for a while. His pal discovered his body in his bedroom … and called 911 shortly thereafter.

Tyler’s one-time costar, Maurice Benard, broke the news about his passing … calling him a “truly talented individual that lit up the screen in every scene he performed and relished bringing joy to his loyal fans through his acting.”

He’d been on ‘General Hospital’ for a very long time, starring in over 1,100 episodes. TC was only 50.

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RIP