The anger over the incident also attracted the attention of Puerto Rico Gov. Ricardo Rosselló.
A woman had accused Officer Patrick Connor of standing by as a man harassed her for wearing a shirt with the Puerto Rican flag, saying it was un-American.
Patrick Conner quit the police department of the Forest Preserves of Cook County, according to a statement from the department.
The viral video clip shows Mia Irizarry, 24, setting up her picnic when a white man approaches and demands to know why she is wearing her shirt, which had "Puerto Rico" written on it.
Cook County Commissioner Jesus "Chuy" Garcia criticized the district for not acting more swiftly to discipline the officer.
In a statement announcing Connor's resignation, officials with the Forest Preserve District of Cook County said that they planned to further address "aspects of this incident" and that they would not provide additional details until Thursday. He was supposed to face a disciplinary hearing Thursday. She asks a park police officer to help, saying: "I am renting this area, and he's harassing me about the shirt that I'm wearing". Trybus was later charged with disorderly conduct and assault.
Quick aside and history lesson: Puerto Ricans are indeed USA citizens.
He added: "The United States of America is a nation that was built and thrives on diversity". But it became widely known this week when a video of the encounter was posted on social media, prompting condemnation from many local activists and politicians and from the governor of Puerto Rico.
Nasatir, a former Cook County prosecutor, pointed out that under IL law, Trybus might be guilty of a hate crime if any of his actions were motivated by his bias against the victim, "From the statements (Trybus) made, and the language used, it's something that certainly should be seriously looked at to see if the hate crime enhancement is appropriate", he said.
Connor was initially placed on desk duty as the investigation got underway. Officers later said he appeared intoxicated. "You don't come here harassing people", she says.
She urged viewers to be slow to judge. Irizarry can be heard asking the park police officer, identified as Connor, for help, and telling him she is uncomfortable.
The female officer then speaks with Irizarry, who gives her version of the incident, and the officer explains they were called to the area after a report a man was choking a woman. 'I told him I felt uncomfortable multiple times and he did not do anything'.
More police arrive, and Irizarry says she still doesn't feel safe. "People have just as much right to be here as you and, when you're drunk, you don't belong here".
"You shouldn't be wearing that", he said, referring to a shirt that read Puerto Rico and displayed the flag.
"The officer should have stepped in, and he should have done something", Forest Preserves Chief of Police Kelvin Pope said at a news conference Tuesday. "This is not the America we all believe in".