Chicago officials and members of the Chicago Police Department gathered in the Lawndale neighborhood on the city’s West Side Thursday to pay their final respects to slain police officer Clifton Lewis.

Lewis was working off duty as a security guard at a convenience store last week when he was fatally shot by robbers in the Austin neighborhood.

Hundreds of police officers dressed in uniform filled United Baptist Church and spilled into its parking lot to say goodbye to the 41-year-old Chicago native on Thursday morning.

Chicago Mayor Rahm Emanuel, Illinois Gov. Pat Quinn and Chicago Police Superintendent Garry McCarthy all eulogized the slain officer during the funeral services.

“It was Lewis’s quite humility, his comforting authority, his calm confidence that defined the officer, the father and friend we say goodbye to today,” said Emanuel.

“He [Lewis] had what was needed to succeed in this profession, an incredible passion for what we are called to do and an extraordinary foundation of support,” said McCarthy.

McCarthy received long, thunderous applause during the service when he promised to catch those connected with Lewis’s death. McCarthy would not comment on details of the ongoing investigation, but the Chicago Police Department said it’s looking at a significant number of leads in connection with Lewis’s death.

The department is offering a $20,000 reward for information about those involved in the crime.