The Adams County Sheriff's Office in Colorado is investigating after an officer down call Wednesday night.
"The entire Sheriff's Office is praying for the wife and family of our fallen deputy".
Gumm was taken to Denver Health Medical Center, where he was pronounced dead.
The flags will be lowered until sunset on the day of the funeral for Gumm, who had been with the sheriff's office since 2013.
10News' Scripps sister station in Denver, KMGH, reported deputies were responding to a report of an assault at around 7 p.m. local time when the shooting occurred.
A manhunt is underway after a sheriff's deputy was shot and killed in Colorado.
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The Colorado Police Foundation has set up a donation site for the deputy's surviving family. You can donate at this link.
The suspect ran off but was later found and taken into custody. They are considered armed and risky. "Not one, but two deputies down in less than a month".
Other residents showed their support for Gumm, other deputies and police in different ways.
Anyone with any information on the whereabouts of Denver Simmons is asked contact the Harrison County Sheriff's Office 24-hour number, 903-923-4000.
"When (police) first arrived they were all running from their vehicles with guns so guns drawn", Stephanie Christoper, who told 9NEWS that she lives in the area, said Wednesday night. Police set up a perimeter around the area after the shooting that remained in place Thursday morning.
Law enforcement is still looking for 2 suspects in the case. "I had an incident with him at one point, and I think he was just a great cop".