A woman from Oklahoma has been charged with four counts of second-degree murder for allegedly crashing her car into a crowd on Sunday during the Oklahoma State University Parade in Stillwater. The incident left four people dead and dozens of people injured.

Twenty-five-year old Adacia Avery Chambers drove into the crowd with her Hyundai Elantra about 65 miles outside of Oklahoma City, authorities said. The police suspected that Chambers was intoxicated, which led to the death of three adults and a two-year-old toddler, according to Reuters.

However, Chambers' lawyer notified that his client did not smell of alcohol when they met a few hours after the incident and was not likely to be in a "drunken stupor."

"In my opinion, Ms. Chambers suffers from a mental illness," Attorney Tony Coleman said, according to CBS News.

"I absolutely can rule out alcohol," he added. "She doesn't remember a whole lot about what happened. There was a period where I think ... she could have even blacked out."

Chambers will face a judge on Monday afternoon.

"I have deep concerns about her competency at this point. I'm not a psychologist or psychiatrist, but I can tell you she's suffering from mental illness," Chambers' lawyer added, according to The Oklahoman.

The police also clarified that the parade crash suspect's car was not part of the Oklahoma State University Parade, but declined to talk about Chambers further. Police Capt. Kyle Gibbs encouraged witnesses and those who have photos and videos to step forward and contact the investigators, USA Today reported.

Mayor Gina Noble, the grand marshal for Sunday's parade, said the 50,000 residents of Stillwater are in shock.

"We've never seen anything like this. We're taking our time to make sure we get everything right," Noble said, USA Today added. "We're shocked. We are definitely subdued in mood and we're still trying to understand."

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