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There was no indication of alcohol in her system.
Heche remains in extreme critical condition.
Her upcoming Lifetime movie,Girl in Room 13,is still slated to premiere in September.
ActorAnne Hecheis extreme critical condition after getting into a fiery car crash in Los Angeles on August 5.
She has a significant pulmonary injury requiring mechanical ventilation and burns that require surgical intervention, a representativetold Deadline.
She is in a coma and has not regained consciousness since shortly after the accident.
Hechereportedlycrashedher car into a Los Angeles home, according to an LAPD spokesperson.
According toTMZ,Heche is under investigation for a felony DUI in connection to the collision.
This, upgraded from a previously reported investigation for a misdemeanor hit and run.
Heche was seen driving erratically and got into a separate minor accident shortly before she crashed.
No arrests have been made as yet.
The investigation is ongoing pending the blood result, an investigator told the New YorkTimes.
This story has been updated throughout.
