Dennis was the son of Jeremiah Collins and his wife Nora (Stokes). His parents immigrated from Ireland and lived on a farm just east of Jacksonville, Morgan. He was listed in Jacksonville in the 1880 census at the age of four.

On Feb 16, 1915 he married Frances C. Hugel in Chicago.

In about 1917 he had a son naed Dennis Patric Collins, Jr.

In 1918 he filled out his draft card for WWI. He was living at 5646 Sheilds Ave in Chicago and was described as; Tall, Medium Build, Light blue eyes with dark brown hair. He was working as a Chicago Police Officer for the 11th Precinct.
https://www.familysearch.org/ark:/61903/3:1:33S7-914J-NV5?i=799&cc=1968530

By the 1930 census he seems to have had a second wife named Delia and was living at 6130 Rhodes Ave. in Chicago.

Dennis died three years later. His death certificate showed he was a retired Chicago Police officer and they were living in Lima, Allen Co, Ohio. He had carcinoma and heart issues.

His body was returned to IL and buried at Holy Sepulchre Cemetery.

https://www.familysearch.org/ark:/61903/1:1:X6QV-THP
Ohio Deaths

Name: Dennis Patrick Collins
Event Type: Death
Event Date: 10 Dec 1933
Event Place: Lima, Allen, Ohio
Address: 539 North West St.
Gender: Male
Age: 57
Marital Status: Married
Race: White
Occupation: Retired Policeman, Chicago
Birth Date: 17 Jul 1876
Birthplace: Jacksonville, Ill.
Birth Year (Estimated): 1876
Burial Date: 12 Dec 1933
Burial Place: Chicago, Ill.
Father's Name: Jeremiah Collins
Father's Birthplace: Ireland
Mother's Name: Nora Stokes
Mother's Birthplace: Ireland
Spouse's Name: Delia Collins

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https://www.familysearch.org/ark:/61903/1:1:Q2HN-L1PK

Dennis P Collins
Illinois, Archdiocese of Chicago, Cemetery Records, 1864-1989
Name: Dennis P Collins
Event Type: Burial
Event Date: 14 Dec 1933
Event Place: Worth, Cook, Illinois, United States
Event Place (Original): Worth, Cook, Illinois, United States
Age: 57
Birth Year (Estimated): 1876
Cemetery: Holy Sepulchre