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Rapper T.I.’s sister, Precious Harris, had cocaine in her system when she suffered a cardiac arrest in a single car accident that led to her untimely death on Feb. 21.

A coroner’s report, obtained by TMZ, indicates Precious died from a cardiac arrhythmia (irregular heart rhythm) brought on by cocaine toxicity which aggravated her preexisting hypertension (high blood pressure).

The cocaine in her blood elevated her blood pressure which triggered an abnormal heart rhythm that disrupted the blood flow to her brain, causing her to black out behind the wheel. was the first to report Precious suffered a cardiac arrest after her car hit a light pole on Feb. 13 in Atlanta. But a source told TMZ‘s editors she suffered an “asthma attack” behind the wheel.

Precious, 66, was driving T.I.’s Dodge Challenger with his grandniece, Kiari Chapman, in the passenger seat when she suddenly lost consciousness and the car veered off the road and hit a light pole.

Precious was placed on a ventilator machine to breathe for her in a hospital intensive care unit. She passed away on Feb. 21 without ever regaining consciousness.

Photo by Thaddaeus McAdams/FilmMagic