AfriPulse
Left inset: Kierstan Morgan. Right inset: Jiler Hainsworth (Bonneville County Sheriff’s Office). Background: Tautphaus Park in Idaho Falls, Idaho, where cops say Kierstan Morgan attacked a 16-year-old girl after being told by her boyfriend Jiler Hainsworth that the teen was flirting with him (Google Maps).
An Idaho teenager allegedly launched a vicious attack on a 16-year-old girl at a park basketball court after her boyfriend claimed the victim had been flirting with him, authorities report.
Kierstan Leann Morgan, a 19-year-old from Idaho Falls, is charged with felony aggravated battery following the assault on the teen in May 2025 at Tautphaus Park, according to documents obtained by East Idaho News.
At the time of the incident, Morgan was at the park with her 17-year-old boyfriend, Jiler Hainsworth. The altercation reportedly began after Hainsworth informed Morgan that the victim was flirting with him while she was playing basketball with friends, the court records indicate.
Footage reviewed by police purportedly captures Morgan aggressively confronting the teen, shouting and issuing threats. Despite the victim’s attempts to leave, Morgan allegedly struck her, knocked her to the ground, and then repeatedly slammed her face into the ground while pulling her hair, police state.
Following the attack, the victim reportedly lost consciousness as she remembered little after being forced to the ground. She received medical attention at a nearby hospital, where she was treated for a mouth injury, loosened teeth, swelling, bruises, and abrasions on her head, face, and arms.
The court documents describe the attack as a “brutal beating,” with Hainsworth allegedly telling bystanders he would hurt them if they stepped in, East Idaho News reports.
Hainsworth was identified through the fight footage; when police questioned him about what happened he was wearing the same clothes he allegedly had on in the video. He was reportedly very rude to cops and claimed he didn’t start the fight, per police.
Hainsworth was charged with felony aggravated battery, felony witness intimidation and misdemeanor assault after being arrested in early February.
If convicted, Morgan will face a possible 15-year prison sentence while Hainsworth will face up to 20 years in prison. Hainsworth is due in court on Feb. 27 for a preliminary hearing. Morgan is scheduled to appear in court on March 10 for a pretrial conference. They’re both currently out on bond, according to online court and jail records.
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