Radio dispatch recordings indicate police were at 44-year-old Loretta Rosa's house checking on a domestic violence call just five hours before she was found dead.
Nancy, a friend who lives next door, says it was a terrifying scene overnight.
She said Rosa ran to her front door, wearing only jeans and no top, begging for help.
Nancy said Rosa's husband dragged her across the street and back inside this house slamming the front door, the last time she saw her friend and neighbor alive.
Family members say Rosa and her husband just got married last year.
9Wants to Know is not using his name or showing his face because police have not identified him as a suspect in his wife's murder.
"It was scary. Just seeing her dragged off here. I've never seen that in my life," Nancy said.
Nancy called 911 around 2 a.m. when Rosa was pounding on her front door.
"She was like 'help me.' And then he grabbed her. And dragged her across to her house. The door smashed her legs. And I called 911," Nancy said.
Recordings of Denver police conversations after Rosa's body was found, suggest police took about an hour to show up.
"The first call dropped about 2 o'clock. A neighbor, female, with no shirt came over. And then a male pulled her back over to the house. The original witness called back asking for an ETA and then crews were dispatched about 3 o'clock," a dispatcher can be heard saying in the recordings.
Police found Rosa's body and arrested a man who they have yet to identify shortly after 8 a.m. Sunday morning.
Phyllis Rosa wonders if her sister would still be alive, had police responded sooner.
"A lady female cop came and was here for one minute and left. The neighbor called the police for help but the police go to my sister's house, shine the light one time then leave while my sister is in there getting beaten to death and nobody is helping her," Rosa said.
Family members say Rosa has five children including the youngest two whom she adopted.
"Thank God they weren't home. Thank God," Nancy said.
Nancy says she'll never forgot the look of terror in her friend's face, in what were likely the final moments of her life.
Family members want to know why police didn't do more to help their sister.
A Denver police spokesperson says they are "aware of the situation," and are investigating.
9Wants to Know will continue digging to learn more about what happened that ended with a mother dead.
If you have a tip for 9Wants to Know investigator Will Ripley, email him at firstname.lastname@example.org or call 303-871-1825.
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