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Eddie Johnson, the department's superintendent, said they would be poring over the network of cameras in the downtown area where the shooting occurred.

\"Mark my words,\" he said Saturday during a news conference, \"we will find them.\"

Rivera and the other officer, who had just finished a \"tour of duty,\" left a nightclub with their two friends at about 3:30 a.m. Saturday and returned to their vehicle, officials said. Two men approached their vehicle, and one opened fire, killing Rivera and wounding one of the friends.

The other off-duty officer and a woman with the group were not injured, police said.

\"PHOTO:
ABC News
PHOTO: An off-duty Chicago police officer was shot and killed while sitting in a vehicle early Saturday morning, March 23, 2019.
>

The Chicago Police Department tweeted photos showing a procession of police vehicles transferring the officer's body to the Cook County medical examiner's office.

The body of the off-duty Chicago Police Officer that was killed is escorted to the Cook County Medical Examiners Office this morning. #CPDMediaCar pic.twitter.com/WqeylhTiBo

— Chicago Police (@Chicago_Police) March 23, 2019

A person of interested was interviewed Saturday. Guglielmi said detectives had identified other people.

\"We continue to identify persons of interest based on the investigation and we are speaking to those individuals,\" he tweeted.

ABC News' Alexandra Faul and Olivia Rubin contributed to this report.

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