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COLORADO SPRINGS, COLO. -- The investigation continued Monday into a carbon monoxide leak that apparently left one dead at a Colorado Springs apartment complex.

Just before noon Sunday, firefighters were called to the Vista Peak Apartments on Potter Drive for a carbon monoxide alarm that was going off, and a resident that was not feeling well.

On scene, the CSFD found more alarms sounding, and two people unresponsive.

One victim died, and the other is in critical condition.

Authorities said an autopsy will determine if the victim actually died from carbon monoxide poisoning.

"This was a really cold weekend, we went on many, many calls for carbon monoxide," Sunny Smaldino, Spokesperson for the Colorado Springs Fire Department, said.

Smaldino said high levels of carbon monoxide were found inside the unit where the victims were discovered.

"We will have to wait until the investigation results come back as for where they were found," she said. "I know they were not in the same room, but both were brought immediately outside."

After the building was evacuated, Smaldino said a hazmat team cleared the units.

In total, she said nine families were displaced Sunday night as a safety precaution.

"There is a state law since 2009 that says if you rent an apartment, that property manager is responsible for providing you with a carbon monoxide alarm," Smaldino said. "If you are on a long-term lease and have not renewed since 2009, they are not obligated to have one for you."

According to the Apartment Association of Southern Colorado, the law also states after the working detector is installed, it becomes the resident's responsibility to maintain.

"Each time the lease does change over they look to make sure the detector is working properly, and they have a battery," Laura Russmann, Executive Director for the Apartment Association of Southern Colorado, said.

She said many times people remove the batteries to use for a remote or toy, and then forget to replace them, or simply do not report a malfunctioning detector to management.

"The owner can not do anything about it if they do not know about it," Russmann said.

The investigation has not revealed if there was a working carbon monoxide detector in the apartment where the two victims were found.

The source of the carbon monoxide also has not been released.

FOX21 called the Vista Peak Apartments Monday afternoon, and the management declined to comment.

One final reminder, if you had work done on your roof this summer, Smaldino said it is a good idea to climb up there and check to make sure all your vents are uncovered and working properly.