Coroner provides details on what led to woman's death after fight at Fort Wayne Tim Hortons

FORT WAYNE, Ind. (WLS) -- Officials are providing new details after a woman died following a fight at a northwest Indiana restaurant back in May.

The Allen County Coroner's Office said 75-year-old Anita Ann Grayson suffered from Acute Exacerbation of Congestive Heart Failure in Setting of Physical Altercation.

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The coroner's office said Grayson's manner of death is undetermined, and the autopsy findings noted "no significant contributory injuries."

Investigators say Grayson got into a fight with a teenage worker at the Tim Hortons in Fort Wayne on May 13.

A shift lead then stepped in and told Grayson to leave, which is when a fight broke out.

Video provided by Fort Wayne police shows Grayson sitting down then collapsing in the store. Some may find the video disturbing.

She was rushed to the hospital, where she died.

Family and supporters gathered for a protest, accusing the city of editing the video and not being transparent.

"I want justice for my mom. Y'all cannot deny it. That everybody that seen what happened to her. Is that how we treat the elderly people in the community?" said Tawnda Grayson, Anita's daughter.

Police say the incident is under investigation.

The CNN Wire contributed to this report.

The video in the player above is from a previous report.