On Sept. 4, the body of Kathleen Mayo was found inside her first floor unit at the Aspect apartment complex in Lone Tree. Police in the Colorado city, located in the southern part of the Denver metro area, say she was murdered .

Residents who still live in the building and asked not to be identified say that crime scene extended into the hallways.

CBS

"There was what looked like a smiley face, and little smears they only stuck with sticky tape. You think it's blood, you think it's something awful, and that really shook us up," one said.

The resident is one of several who reached out to CBS Colorado with concerns about when police and apartment management informed them of the crime.

They say they also have lingering questions about their own security.

"We have fobs. There are came

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