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Monday morning, Chicago police said 24-year-old Menelik Jackson of South Holland and 32-year-old Jovan battle of Chicago have each been charged with first degree murder. Police said Jackson and Battle fired into the car in River North Saturday, killing Rivera and critically wounding another man.
RELATED: Off-duty Chicago cop killed in River North shooting identified
Jackson and Battle have each been charged with one count of first degree murder and three counts of attempted first degree murder. Jackson was also charged with resisting/obstructing a peace officer.
Chicago Police Chief Communications Officer Anthony Guglielmi said Jackson was the shooter and Battle was a co-conspirator. Guglielmi told ABC News that one of the men was an applicant to be a police officer CPD and was arrested during his background polygraph for committing an armed home invasion.He was given probation.
Superintendent Eddie Johnson will speak about the charges at a press conference at 11 a.m.
Officer John Rivera was shot and killed early Saturday morning in River North following a night out with friends. Police are scouring large amounts of surveillance footage showing exactly what happened, according to Superintendent Johnson.
Meanwhile, squad cars from every one of the city's 22 police districts accompanied Officer Rivera's hearse from the Medical Examiner's office to an East Side funeral home Sunday.
WATCH: SUPT. JOHNSON SPEAKS AFTER OFF-DUTY COP SHOT
WATCH: Chicago Police Superintendent Eddie Johnson holds press conference on off-duty officer shot and killed in River North
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His District 6 colleagues saluted his casket as it was taken inside and then consoled each other as they continued to grieve for one of their own.
"He always wanted to be a police officer," said Marco Arias, a childhood friend. "That's something we always knew. He always wanted to serve our community and serve Chicago.. It was something he was always set on. Something he always understood. Something he knew he had to do. Something he felt he had to fulfill."
Officer Rivera lived on the Far South Side with his family. He was just 23 years old and based out of the 6th Police District.
Police said they have footage of him getting into his car on Clark between Erie and Huron accompanied by three friends. Shortly after, three men walked up to the car and didn't say a word before one of them opened fire.
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Police have not released a motive for the shooting.
FUNERAL ARRANGEMENTS FOR OFFICER RIVERA
Visitation will be held 3 p.m. to 9 p.m. Thursday at Elmwod Chapel, 11200 S. Ewing Ave, Chicago.
Funeral prayers will be at 9:15 a.m. Friday at Elmwood Chapel. Funeral Mass starts at 10 a.m. at the Church of the Annunciata, located at 11128 S. Avenue G, Chicago.
For more information visit Elmwood Funeral Chapel and Crematory.