The officer was 51 years old, and lived in the 8th District.
He died at his home in the Chicago Lawn District on the Southwest Side, the spokesman said.
A death investigation is ongoing.
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He is at least the seventh Chicago police officer to die by suicide this year.
A female police officer in her 30s was also found dead in a home of an apparent suicide Tuesday morning.
The female officer had been on the force five years and had been working as a tactical officer in the 1st District downtown, CPD previously said.
On Dec. 15, a 58-year-old female officer was found dead in the 5800-block of North Northwest Highway, also as the result of an apparent suicide.
CPD Supt. David Brown said in a statement:
"The men and women of the Chicago Police Department are everyday heroes who serve and protect with great honor and courage. Each day, they make the choice to put their own safety at risk to protect the people of our city. Our officers repeatedly respond to traumatic incidents and are not immune to the pain and cruelty surrounding these incidents. They do this while balancing their own personal lives and difficulties. This is why it is crucial we strengthen and expand the resources and support systems for our officers.
The recent tragedies we have faced are immensely devastating for the families and loved ones of those we have lost to suicide, as well as every member of the Department. I ask that the people of Chicago continue to keep all those affected in your prayers. I also ask that you take a moment to think about everything our officers give of themselves to do this job that many others wouldn't. We must do more to protect the brave men and women who protect us."
Mayor Lori Lightfoot also released a statement that said in part, "Tragically, over the past two weeks, we have lost three Chicago police officers by apparent suicide. My heart goes out to their friends, family, and fellow officers during this difficult time."
Sun-Times Media contributed to this report.
If you are experiencing suicidal, substance use or other mental health crises please call or text the new three digit code at 988. You will reach a trained crisis counselor for free, 24 hours a day, seven days a week. You can also go to 988lifeline.org or dial the current toll free number 800-273-8255 [TALK].