Apartment 7 is now surrounded by flowers, candles, balloons, and pictures of Kayleigh.
The details of her death are disturbing.
"The investigators noted what appeared to be blunt trauma injuries on the victim," Napa Police Lt. Debbie Peecook said. "Follow up injuries indicated the victims appeared to be sexually assaulted."
Police have arrested the little girl's mother Sara Krueger, along with boyfriend Ryan Warner.
"Just by looking at him you could tell he was a heartless person," neighbor Guadalupe Sanchez said.
Police found Kayleigh's body while doing a welfare check on the apartment on Saturday. They found the couple on Sunday at the El Cerrito BART station after receiving an anonymous tip. The family is grateful that they were spotted.
They face arraignment on Tuesday and wrath from friends, family, and neighbors.
Step-sister Savannah Fanjul and family friend Samantha Kerney describe Sara Krueger as having battled drug addiction and say boyfriend Warner had dragged her back into it.
These women were not in any kind of excusing mood.
"I think the death penalty isn't out of range, I really don't," Kerney said. "You murder a child and should be hung from the highest tree."
"How could you forgive someone who did that? She was 3 years old," Fanjul said.
Friends and family members held a candlelight vigil last night for Kayleigh. Her distraught grandfather said he is struggling with her death and that his daughter is the accused murderer.
"You couldn't imagine what I am going through. The proudest moment of my life is gone forever and there is nothing we can do or say that is going to bring her back," said John Kreuger, Kayleigh's grandfather.
A police spokesperson said the suspects are known meth and marijuana users. Police said they were at the apartment on January 27 because a neighbor heard fighting. The couple claimed it was just a verbal argument.
ABC7 News reporter Amy Hollyfield contributed to this report.