Testimony began Tuesday in the trial of Lounsbury, who is charged with two counts of first-degree murder in the deaths of her father and stepmother on Jan. 14, 2009.
Hap and Velva "Sue" Enander were found shot to death in their home in rural Adams County near Hudson.
Prosecutors and the defense team disagree on which of Hap Enander's two adult children killed him and his wife.
Jurors were warned to expect graphic testimony and evidence related to the crime scene.
The first prosecution witness, Lynda Higgins, a close friend of the Enanders, described discovering the crime scene.
"I felt hate. I felt anger," Higgins said.
Following Higgins' testimony, a video of the crime scene was played.
As a sheriff's deputy camera panned over Sue Enander's body crumpled on her bedroom floor, Higgins, seated in the courtroom, gasped and covered her face.
Lounsbury, seated the base of the projector screen where the video was being played, averted her eyes.
Adams County Chief Deputy District Attorney Jim Colgan told jurors in his opening statement that Lounsbury needed tens of thousands of dollars for back surgery. Colgan said a series of circumstantial evidence points to Lounsbury as the killer.
Defense attorney Chad Oxman used a portion of his opening statement to suggest that some of that evidence was provided by Hap Enander's son, Jared, in an effort to frame his sister.
"Everything pointed to Jared Enander and now the DA... points to Miss Lounsbury," Oxman said. "The prime suspect now becomes the lead detective."
Jared Enander provided investigators with video surveillance of his parents' house from his neighboring property.
He suggested the person seen coming and going on the surveillance tape on the night of the killings is his sister.
Prosecutors also say the video is of Kara Lounsbury.
During his testimony, Jared Enander said his sister asked him point blank why he never killed their father in retaliation for their troubled childhoods.
He also testified about his parents' will and said his sister watned to get into the house to see the will and see what she was getting in it.
Jared Enander's testimony is set to continue on Wednesday.
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