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Gary was a married father of an infant while Marmolejo was a married father of three children, WLS reported.

\"We are all mourning the loss of our extended family,\" Chicago Police officials told ABC News via email. \"However, our officers continue to protect and serve their communities, even in the most difficult of circumstances.\"

\"This knocks you back on your heels,\" Chicago Mayor Rahm Emanuel told reporters.

\"There are no words to express our grief, our sense of loss,\" Emanuel said. \"We as a city have to measure up and remind them, they're part of our family.\"

\"PHOTO:
E. Jason Wambsgans/Chicago Tribune/TNS via Newscom
PHOTO: South Shore passengers are transferred to buses at the 103rd Street Rosemoor stop after two Chicago officers were killed by a train while investigating a call of shots fired, Dec. 17, 2018.
>

Gary and Marmolejo's deaths are the third and fourth for the Chicago Police Department this year.

In November, Chicago police officer Samuel Jimenez was fatally shot in the neck while trying to protect employees and patients during a shooting at Chicago's Mercy Hospital.

In February, Chicago police Cmdr. Paul Bauer was shot and killed. Bauer, survived by his wife and daughter, had been sitting in his squad car when heard a call over the radio and pursued a gunman on foot.

The mayor on Tuesday urged Chicago residents to show the police department that it has \"your support.\"

\"When you think about Commander Bauer, officer Jimenez, you think now about Eduardo [and] Conrad,\" he said. \"The Chicago Police Department needs the family of Chicago. ... We have a responsibility today to show up for them.\"

Other police departments have been offering their condolences for the latest slain Chicago officers, who were members of the department's fifth district.

Procession is approaching the @ChicagoCAPS05 5th District station where fellow officers will pay final respects and family members will join in the procession to the Medical Examiner pic.twitter.com/2ij52XqJV9

— Anthony Guglielmi (@AJGuglielmi) December 18, 2018

Our thoughts and prayers are with the family, friends, and Chicago Police Department colleagues of Officers Conrad Gary and Eduardo Marmolejo who gave their lives in the line of duty last night protecting the citizens of Chicago. pic.twitter.com/MDyu4IgkDj

— Oak Lawn EMS-Fire-Rescue (Official) (@OLEMSFIRERESCUE) December 18, 2018

Today our thoughts and prayers are with the @Chicago_Police Department and the friends and families of Officers Conrad Gary and Eduardo Marmolejo who were killed in the line of duty yesterday while searching for a suspect.

Godspeed brothers. #GoneButNotForgotten #ThinBlueLine pic.twitter.com/BvbyCtihdA

— NJSP - State Police (@NJSP) December 18, 2018

We offer our sincere condolences to the @Chicago_Police on the tragic loss of Officers Conrad Gary and Eduardo Marmolejo. Our thoughts and prayers are with CPD, Supt. Johnson and the families. @pcm_chicago pic.twitter.com/QyJRNy7817

— Chief James Kruger (@chiefkruger) December 18, 2018

The members of the 19th District stand with our colleagues in the @ChicagoCAPS05 th District at this terrible time. Our condolences to the families and friends of Officer Eduardo Marmolejo and Officer Conrad Gary. RIP Brothers. pic.twitter.com/C70yLF6Y8k

— Chicago Police 19th Dist - Town Hall (@ChicagoCAPS19) December 18, 2018

The 25th District would like to send our condolences to all the men and women of the 5th District. May you find comfort in this very sad time. Rest In Peace Officers Eduardo Marmolejo and Conrad Gary.
Commander Anthony J. Escamilla & the 025 District.

— Chicago PD 25th District (@CPD25thDistrict) December 18, 2018

Our hearts are heavy with the news of the line-of-duty deaths of two more brothers in blue. Sending our thoughts and support to @Chicago_Police and the families of Officers Conrad Gary and Eduardo Marmolejo. https://t.co/gnG3Ok0yLU

— NapervillePD (@NapervillePD) December 18, 2018
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