The Forest Preserve District of Cook County Police Department - where Mr Connor worked for 12 years - announced he had resigned late on Wednesday.
Despite Connor's resignation, the forest preserve district says officials continue to investigate the incident.
On Monday, Forest Preserves of Cook County, which administers the park, tweeted that it was aware of the incident and video, and that it had launched an investigation.
Irizarry posted the video of Trybus's racist rant and Officer Connor's lack of response on Facebook, where it attracted huge attention across the country and around the world. The recording, taken by the woman involved, shows a man, identified by the police as Timothy Trybus, demanding to know why she has a Puerto Rican flag shirt on and whether the woman, Mia Irizarry, is a US citizen.
He added: "The United States of America is a nation that was built and thrives on diversity".
In the video, Trybus can be heard saying, "You should not be wearing that in the United States of America. Ok".
Irizzary had paid for a permit to hold a birthday party at Caldwell Woods when the man - who has been identified as Timothy Trybus - first approached her.
At one point in the video, Irizarry tries to move away from Trybus and walks out from under a pavilion, but he follows her as Connor appears not to approach them.
During the encounter, Irizarry asks Officer Connor to intervene as she feels "highly uncomfortable" as the 62-year-old continues to intimidate her.
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"After a review of the case, we approved felony hate crimes charges", said Robert Foley, spokesman for the Cook County State's Attorney's Office, as reported by the Tribune.
The charges stem from a June incident in which Trybus, who was reportedly intoxicated, confronted a woman for wearing a shirt with the Puerto Rican flag emblazoned across the front. As we said yesterday, if a white woman said she was being harassed by a Black or Latin person, the police would have reacted with a quickness.
The officer can then be seen talking to the man who gesticulates back and tells him to "shut the f*** up". "We are looking at ways to improve all aspects of employee training", said Cook County Forest Preserves General Superintendent Arnold Randall.
I showed my official ID as a Member of Congress, to which the officer said, "I don't think so", indicating that she thought my ID was a fake and that I couldn't possibly be a Member of Congress.
Officer Patrick Conner was initially placed on leave pending an investigation. The woman, Mia Irizarry, is heard appealing to the officer to help restrain the man, but the officer doesn't appear to engage until almost 10 minutes later, when other officers arrive.
Irizarry filmed the video about a month ago, but it has gained recent traction and since been watched more than a million times.
"And when you're drunk, you don't belong here", the officer tells Trybus. This is not the America we all believe in'.
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