TikTok star Marquay The Goat 's sudden death is now believed to be connected to a serious car accident he was involved in just a couple weeks ago ... according to the county coroner.

Buddy Bryan , the Muscogee County Coroner, tells TMZ ... Marquay Collins -- the TikToker's real name -- was pronounced dead at his home on Wednesday.

However ... Bryan says Marquay was in a car crash on November 7th and was taken to the hospital, where he was evaluated and released the same day. After returning home, he began complaining of headaches, along with neck, shoulder and spine pain. Gallery Launch Gallery

Bryan also says Marquay told his brother he was experiencing shortness of breath and headaches before his death.

While Marquay's case has formally been ruled undetermined ... Bryan b

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