"Diane Schuler died in the crash and the charges died with her," Westchester County District Attorney Janet DiFiore said.
In early August investigators said Schuler had at least 10 drinks and had large quantities of THC, the active ingredient in marijuana, in her system before driving the wrong-way down the Taconic State Parkway.
Schuler had a blood alcohol level of .19, more than double the legal limit, according to a statement released by Difiore, citing a Westchester County medical examiner toxicology report.
Betsy Spratt, Westchester director of toxicology, said "there were approximately 10 drinks still in her" that had not metabolized yet.
Investigators have not yet determined if Schuler was drinking while driving, but a bottle of vodka was found at the crash scene, according to State Police Major William Carey.
The report also found "high" levels of THC, the active ingredient in pot, but it was not clear when or how much Schuler smoked.
"With that level of alcohol we talk in ranges. She would've had difficulty with perception, judgment and memory. Around that level you get tunnel vision," Spratt said.
Schuler's husband, Daniel, insisted that the toxicology report was wrong and said he has never seen her drunk.
"She did not drink. She was not an alcoholic," he insisted on Aug. 6. "Something medically had to have happened."
Barbara, the Schuler's lawyer, said Diane Schuler was a diabetic, suggesting that may have contributed to her disoriented condition on the morning of July 26.
Barbara also suggested Schuler may have suffered from a stroke, although the autopsy report showed no signs of stroke.
The co-owner of the upstate New York campground said she saw Diane Schuler leave that morning.
"If she had alcohol on her breath, I sure didn't smell it," Scott said. "The last thing I said to her was 'have a safe trip home' and she said, 'We will' and that was the end of it."
Despite what the toxicology report indicated, Daniel Schuler insisted on Larry King Live earlier this month that his wife had not been drinking.
"We will know the truth and I know my wife. She's not an alcoholic," Schuler told King.
"But I mean , OK, but we'll never know. And since we'll never know, why keep on doing this?" King asked.
"The truth, the truth will come out," Schuler responded.
"Does it give you pause to think that maybe, just maybe she was a drinker and you didn't know it," King asked.
"I've been with her 13 years," Schuler said. "Absolutely not."
During the interview Schuler was asked what he would say to the relatives of the people in the other car.
"Oh, I say that a drunk driver did not do this to your family. Something medically had to have happened," Schuler said.
ABC News' Kate McCarthy contributed to this report.