In her final moments, Katherine "Kate" Hanson-Tsao fought to live.
But she was unable to thwart her attacker, whose merciless blows left the 31-year-old Aurora woman with catastrophic injuries.
In a nearby room, her husband, Jimmy Tsao, 34, never saw it coming. He likely was struck from behind.
The heart-wrenching testimony came Friday as a forensic pathologist who conducted the couple's autopsies told jurors in explicit detail how they died.
His findings capped off an emotional week in a DuPage County court saturated with crime scene photos and graphic testimony.
Eric C. Hanson may face the death penalty if convicted of killing his parents, sister and brother-in-law in late September 2005 after stealing $80,000 from his folks in an elaborate credit card scheme.
Hanson, 31, is expected to testify that his parents were letting him pay them back, thus he lacked a financial motive to kill. Prosecutors, though, presented evidence Hanson continued the scam, even after his sister and mother confronted him, to keep up his lavish lifestyle.
On Friday, forensic pathologist Scott Denton testified Kate and Jimmy Tsao died from catastrophic skull and brain injuries after being pummeled with an unknown pipe-like object.
Tsao did not have defensive wounds. The killer repeatedly beat him on his head and face while he sat on a love seat watching television and playing a game on his laptop computer.
But Kate put up a fight to live. She suffered horrific face and head injuries, defensive wounds and massive blood loss. Her older sister, Jennifer Williams, left the courtroom before Denton began detailing each injury. A stoic Eric Hanson listened, but declined to review autopsy photos of his slain sister.
Authorities allege he attacked his sister and brother-in-law, then hours later, fatally shot his parents, Terry and Mary Hanson, as they slept in their Naperville home, where Eric also lived. Police did not find signs of forced entry to either home; valuables weren't touched.
The Hansons' bodies were moved to the Tsao home in Aurora, and someone cleaned up evidence of the shooting to try to conceal the second crime scene. Its existence is crucial because, if true, that means Eric Hanson was home when his parents were killed but, as he will testify, didn't hear anything.
Prosecutors presented about 40 witnesses and 350 pieces of physical evidence, including many graphic photos. They lack a confession and the murder weapons. Instead, they are focusing on the financial motive, timeline and other evidence. They said a rubber glove with his father's blood was in Hanson's SUV, along with Jimmy's Rolex watch and Kate's $24,000 wedding ring.
John Collins, the DuPage County sheriff's crime lab director, testified Friday that the two bullets in the victims' bodies were identical to a third fired bullet found in the Hansons' attic space near the bed where they were shot.
Collins also told jurors other physical evidence, such as the plastic baggie that held the rubber glove, is similar to those found in the Naperville house.