Sources tell TMZ Shawn King's depression may have led to a recent suicide attempt started, continued and never stopped over Larry King's alleged affair with Shawn's sister.

Shawn overdosed on prescription meds last month and left two handwritten notes, including one in which she wrote that she wanted to be buried in Provo, Utah.

EMTs -- who responded to Shawn's home after her dad called 911 on May 28th and said he was unable to wake Shawn -- say they found 8 scripts -- Ambien (sleep aid), Klonopin (anti-anxiety), Compro (for schizophrenia), Prometrium (regulates ovulation), Clonazepam (anti-anxiety), Cymbalta (anti-depressant), Lyrica (anti-seizure) and Subutex.

Subutex is commonly used to treat narcotic addiction. Shawn went to rehab in 2008.

Authorities say many of the bottles were empty.

As for what may have triggered a suicide attempt ... we're told Shawn has been "extremely depressed" for more than 5 years ... and the trigger was Larry King's alleged long-term involvement with her sister, Shannon Engemann.

Although Shawn's father reportedly says the incident was an accident -- we're told Shawn has struggled for years, believing her husband remained involved with Shannon. One source says, "She fought like crazy to remain sane, just to take care of her kids."

Shawn and Larry both filed for divorce in April -- we're told the trigger was the alleged affair with Shannon.

Shannon has denied an affair. Larry has not spoken publicly about it.

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