A shocking case out of Colorado is leaving even seasoned investigators rattled after a 33-year-old woman allegedly carried out a gruesome, rage-fueled attack on her boyfriend—then calmly tried to treat him as he lay dying.
Authorities say Shenting Guo is accused of killing her boyfriend, Dustin Nalls, during a violent confrontation that spiraled out of control after she reportedly believed she was pregnant.
According to arrest documents, the couple had been arguing over the paternity of the supposed child when things suddenly turned violent. Investigators say Guo admitted she became overwhelmed with anger and stabbed Nalls during the dispute.
But the horror didn’t stop there.
Authorities allege Guo went on to mutilate her boyfriend before leaving him gravely injured. In a chilling twist, she then reportedly went to a nearby store to buy rubbing alcohol, antibiotics, and beer—returning to administer basic care like ibuprofen and water, despite the severity of his injuries.
By the time help could have made a difference, it was too late. Nalls died from his wounds.
In an even more bizarre development, officials later confirmed Guo was not pregnant.
Months after the killing, Guo has now been deemed mentally incompetent to stand trial following evaluations by both state and defense psychologists.
She is currently waiting for a bed at the Colorado Mental Health Institute at Pueblo, where she will undergo treatment aimed at restoring her competency.
Once admitted, doctors will work with her for several months before determining whether she can understand the charges against her and assist in her own defense. If she is eventually ruled competent, the case will proceed to trial back in Mesa County.
The disturbing details—and the delay in treatment due to limited psychiatric resources—are sparking renewed debate about how the justice system handles defendants suffering from severe mental health issues.
Cases like this often sit in limbo, with suspects waiting weeks or even months for placement in state facilities, leaving families of victims searching for answers while legal proceedings stall.
For now, one thing is clear: what began as a domestic argument has turned into a deeply unsettling case that continues to unfold—with justice, and closure, still hanging in the balance.
