A journal, a court protection order and an armed figure outside a Maple Valley home converged before deputies made an arrest.
MAPLE VALLEY, Wash. — When Trinity Morley left home on a July night in 2025, her parents were concerned enough to search her room. What they found prompted a 911 call, sent deputies toward her former boyfriend’s home and eventually became part of a criminal case that has now ended with a 17-month prison sentence.
Morley, who was 19 at the time and is now 20, pleaded guilty in August 2026 to attempted first-degree assault with a domestic violence designation. A judge sentenced her Sept. 25 to 17 months in prison and 36 months of supervised release, according to published reports based on King County court records. She was also ordered to stay away from her former boyfriend for 10 years. The sentence came roughly 14 months after the night her parents found the journal that transformed their concern into an emergency.
The parents’ actions did not begin that night. According to court documents reviewed by Law&Crime, they had already become worried about Morley’s attempt to buy a shotgun and what they described to investigators as a history of serious mental health concerns. They sought an extreme risk protection order, and reporting on the case said the order was in place about a week before the July 27 confrontation. Prosecutors said the order, together with the state’s waiting process for the firearm purchase, prevented Morley from completing the shotgun transaction herself.
Then came the journal. Morley had told her parents she planned to go out and graffiti houses, prosecutors said. After she left, they entered her room and found writing that described having a shotgun and ammunition and going after her former boyfriend. One of the passages quoted in court reporting referred to having “three chances” and not wanting to turn to knives. Rather than reproduce the full passage, the important fact for the case was its apparent description of a planned armed attack. Her parents called 911 and asked authorities to find her.
Their concern became more urgent when Morley’s father checked her phone location and saw that it placed her near the former boyfriend’s Maple Valley house, according to the prosecution account. The family’s warning gave deputies a name, a possible target and reason to believe a firearm was involved. But police were not relying on only one household’s report. A second family was simultaneously experiencing its own emergency at the other end of the suspected plan.
At the former boyfriend’s home, his father saw a person outside through the family’s security system. He described a woman wearing dark clothing and a face covering and carrying what he believed was a firearm. FOX 13 Seattle reported that he moved family members upstairs because he feared for their safety and called 911. Video later released in connection with the case showed a hooded figure with a shotgun outside the residence. Authorities said that figure was Morley. Her former boyfriend, however, was not home.
Those two calls placed law enforcement between the family that feared what Morley was about to do and the family that believed an armed stranger was already outside its home. By the time deputies reached the area, the figure had moved away from the property. Investigators searched nearby and used a drone to locate Morley on a dock, according to the King County Sheriff’s Office account reported by Court TV. She was still armed with a shotgun and had a knife.
The arrest did not end in gunfire. Authorities said Morley expressed suicidal intent while deputies were trying to take her into custody. One deputy approached slowly and talked with her until she put down the weapons. She was then arrested. No one at the former boyfriend’s home was physically injured, and neither Morley nor the deputies were shot. Prosecutors later alleged that Morley had intended to kill her former boyfriend before dying herself, an assertion they said was supported by her post-arrest statements and writings.
The shotgun recovered that night had not come from the purchase her parents tried to stop, according to prosecutors. Instead, Morley had obtained a gun from the boyfriend she was dating at the time. Court filings summarized by Law&Crime said she told him she was receiving threatening messages and needed a firearm for self-defense. Prosecutors said she had misled him about why she wanted the gun. They also described writings in which Morley apologized to him for lying.
That detail gave the case an unusual sequence. A legal order had interfered with one route to a firearm, but prosecutors alleged that Morley secured a different gun through someone who believed he was helping protect her. The public reporting does not indicate that the boyfriend who supplied the shotgun knew of the alleged plan against her ex-boyfriend, and there is no indication in the reviewed sources that he was charged with a crime related to the incident.
Investigators also examined Morley’s explanation for why she wanted to harm her former boyfriend. She told authorities she had previously accused him of sexual assault. Prosecutors said she made that report in May 2025, but no charge was filed against him after investigators closed the case as unfounded. The available reporting does not provide the full investigative file on that earlier allegation, and the former boyfriend has not been publicly identified. News accounts therefore establish the disposition of the police investigation, not an independent finding about every aspect of the prior relationship.
After Morley surrendered, the prosecution pointed to additional evidence beyond the journal and the weapons. Security footage documented the armed figure at the home, while in-car and other law enforcement video captured Morley after her arrest. Prosecutors described her demeanor in custody as “eerie,” saying she smiled, rolled her eyes and at one point commented on an officer’s account of what had happened. Those descriptions became part of the state’s early presentation of the case, though Morley’s later guilty plea made a trial over the original accusations unnecessary.
Morley was initially charged with attempted first-degree murder and held on $500,000 bail. That charge reflected prosecutors’ theory of her intent when the case first entered court. The final conviction was different. In August 2026, she pleaded guilty to attempted first-degree assault with a domestic violence designation, the offense on which her September sentence was based. Published accounts of the sentencing do not detail every term of the plea agreement or explain precisely why the attempted murder charge was replaced by the assault offense.
Seen from the point of view of Morley’s parents, the case unfolded as a progression of escalating steps rather than one isolated emergency call. They became concerned about a firearm purchase, sought a court order, continued watching her behavior, searched her room after she left home, read the journal, checked her location and contacted police. None of those actions by itself explains the full outcome. Together with the second family’s call and the deputies’ response, however, they formed the chain of events that prosecutors said prevented the threatened confrontation from reaching the former boyfriend.
The sentencing gives that chain a defined legal endpoint. Morley’s 17-month prison sentence is paired with three years of supervised release and a no-contact requirement that lasts far longer than the custodial term. The order bars contact with her former boyfriend for 10 years. The reviewed public reports do not identify any additional scheduled proceeding that would change the conviction or sentence.
Author note: Last updated November 10, 2026.