Ronnie Turner, son of Tina Turner, passed away after a battle with colon cancer ... according to the L.A. County Coroner's Office.
TMZ has confirmed Ronnie's autopsy results, which say the 62-year-old actor died due to "complications of metastatic colon carcinoma." The coroner says the cancer was stage 4.
The report says Ronnie only struggled with cancer for 3 weeks before his death.
It's also determined Ronnie battled atherosclerotic cardiovascular disease at the time of death -- which is a buildup of fats and cholesterol in the arteries.
TMZ broke the story ... law enforcement got a 911 call Thursday morning from a person who said Ronnie was outside their home and having a hard time breathing. A few minutes later, he stopped breathing.
Paramedics rushed to the San Fernando Valley address -- where bystanders were attempting CPR, but those efforts didn't work and he was pronounced dead at the scene.
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An outpouring of love has been shared for Ronnie since his death ...Tina posted a message about her son, saying, "Ronnie, you left the world far too early. In sorrow I close my eyes and think of you, my beloved son."