Man Horrified After Learning Girlfriend’s Evil Secret

Austin settled into its evening hum on May 11, 2022, unaware that a tightly wound love triangle was about to snap. At 1708 Maple Avenue, a visiting cycling star—Mariah “Mo” Wilson—was staying with her friend Kaitlyn Cash, preparing for a weekend race. Elsewhere in the city, Colin Strickland, a well-known gravel cyclist and Mo’s former boyfriend, drifted between loyalties—texting, meeting, and masking connections he couldn’t fully let go of. And in the shadows, his girlfriend, Caitlyn Armstrong, watched, waited, and took steps that would echo far beyond a single night.

What began with a panicked 911 call and a missing bike quickly unraveled into a meticulously planned killing. The clues were subtle; the implications, devastating. Here’s a structured overview of how it unfolded.

– At around 9 PM, Kaitlyn Cash returned home and found her friend, Mariah Wilson, on the bathroom floor, covered in blood. She called Austin 911: “My friend is staying with me and I just walked in and she’s laying on the bathroom floor and there’s blood everywhere… she’s not breathing.”
– Officers arrived, initially suspecting a robbery gone wrong—Mariah’s $14,000-plus racing bike (noted as a $114,000 racing bike in Cash’s account) was missing, and she had been staying there for an upcoming bike race.
– Inside the home’s tight bathroom space, officers observed cerebrospinal fluid (CSF) on the floor—evidence that bullets had pierced Mo’s skull, killing her instantly. No lifesaving attempt could have changed the outcome.- Officers canvassed the house and nearby woods for the missing bike. They located it dumped close to the scene—placed in a way that suggested a deliberate red herring to send police chasing the wrong motive.- Police brought Cash to the station for a gunshot residue (GSR) test. The test was negative.
– Given the cramped crime scene and the timeline, officers concluded Cash could not have fired the shots.
– Cash shared crucial context: Mo spent the afternoon with her ex-boyfriend, Colin Strickland. They had gone swimming, then drinks—returning to Maple Avenue shortly before Cash came home and found Mo.- Cash reported leaving for dinner around 5:30 PM and returning just minutes before calling 911.
– Mo and Colin had met to swim; they later visited a cafe (Pool Burger) for drinks.
– Officers identified the bike race connection and the high-value bike, but as evidence coalesced, the bike theft theory receded.- Neighborhood CCTV captured a black Jeep driving toward Maple Avenue and down the back alley near the house where Mo was staying.
– A doorbell camera recorded Mo’s screams and gunshots; then the vehicle left.
– The footage was grainy—no plate, no clear driver—but the Jeep’s presence at the critical moment would become decisive.- Officers visited Colin’s home—and found a black Jeep parked outside, with a bicycle rack attached.
– In conversation, officers avoided telling Colin precisely how Mo died, as is standard in homicide investigations. Colin appeared shaken, struggling to hold eye contact.
– Colin confirmed knowing Mo, clarified her nickname “Mo,” and provided general contact details. He described spending the afternoon with her—swimming, drinks, and dropping her off at Maple Avenue close to dusk.
– Investigators learned about Colin’s relationship history:
– Colin and Caitlyn Armstrong had been together for roughly 1.5–2 years, split in October 2021, then reconciled in November.
– During the breakup, Colin had a month-long romantic relationship with Mo, and he remained in contact with her afterward.
– Police ran the Jeep’s plates: it didn’t belong to Colin. It was registered to Caitlyn Armstrong.
– This discovery—paired with Colin’s continued bond with Mo and Caitlyn’s jealousy—made Caitlyn a primary suspect.
– Colin supplied a timeline:
– Swimming and drinks, then dropping Mo off “just before dark,” around 8:30 PM.
– He texted Caitlyn afterward; she replied from a yoga class and arrived home around 9:20–9:21 PM in yoga attire, carrying a mat.
– Caitlyn had mentioned a laser hair removal appointment at 7:00 PM downtown that evening. Colin couldn’t confirm where she did yoga.
– Colin admitted he changed Mo’s name in his phone because Caitlyn checked his messages and got jealous—he wanted to avoid fights.- Police brought Caitlyn in, leveraging a minor “theft of service” warrant as a pretext to talk.
– During the interview, the detective maintained a calm tone, separating the warrant (which put Caitlyn briefly in cust
ody) from questions about the homicide.
– Caitlyn asked if she needed an attorney. The detective began Miranda warnings but soon received surprising news: the warrant tied to Caitlyn’s name contained the wrong date of birth. It belonged to someone else. She was no longer under arrest.
– Caitlyn stated she wanted to leave and insisted on having an attorney present. At that point, questioning about the homicide had to stop unless she consented.
– Before she walked out, the detective revealed a critical piece: “Your vehicle was seen next to her house.” The detective pressed for an explanation—jealousy, proximity, anything that might contextualize the Jeep’s presence. Caitlyn declined to talk further and left.- Police interviewed Colin again, this time with his lawyer present.
– He described the October breakup and Mo’s visit as a surprise; he said he was ready to move on but spent the week with Mo. He and Caitlyn later resumed cohabiting in separate rooms; Caitlyn was on Bumble, dating several men. He claimed he didn’t believe Caitlyn would dwell on Mo given that she also seemed to be moving on.
– Asked whether Caitlyn could hurt someone, Colin emphatically said no. If he’d believed she was capable of violence, he would have removed himself from the situation.
– On firearms, Colin admitted he had purchased guns in December for Caitlyn’s self-defense—he thought the range was south of I-35. Police later determined the caliber matched shell casings at the murder scene.
– Investigators compiled cell phone data and surveillance footage to map movements:
– Colin and Mo: swim, then Pool Burger around 7 PM; then Maple Avenue.
– A black Jeep—eerily similar to Caitlyn’s—appears driving down the back alley near Maple Avenue as Colin drops Mo off.
– Colin’s phone data places him driving away before Mo’s death, clearing him.
– Moments after he leaves, a doorbell camera records Mo screaming, then gunshots. With Colin cleared and Cash negative for GSR, only Caitlyn’s movements were unaccounted for during the crucial window.
– The accumulating evidence pointed inward: Caitlyn’s black Jeep at the scene; jealousy and prior conflict; a gun purchased by Colin in December whose caliber matched the casings found near Mo’s body.
– Just hours before police completed their timeline and prepared to move on Caitlyn, she vanished.
– Investigators found that Caitlyn had used a fraudulent passport—originally tied to her sister—to leave the country. A warrant for her Gmail records revealed a one-way flight to Costa Rica.
– Austin-Bergstrom International Airport CCTV showed her boarding the plane.
– In Costa Rica, Caitlyn booked a hostel in Santa Teresa Beach and worked as a yoga instructor.
– Officers used a subtle lure: a social media post seeking a local yoga teacher. Caitlyn responded and agreed to meet.
– By then, she had undergone several surgical procedures to alter her appearance. But the arresting officer recognized her by her eyes. She was detained and flown back to the United States.

– In October 2023, during a medical appointment outside jail, Caitlyn tried to flee again—jumping from a bathroom window and running. She was caught almost immediately.

– The case rested on converging proof:
– Surveillance footage of the black Jeep near the scene;
– The timeline of Colin and Mo’s movements, and Colin’s cleared phone data;
– Testimony about jealousy and concealed communications (including Colin’s altered contact name for Mo);
– Ballistic analysis matching shell casings to the caliber of the gun purchased for Caitlyn.
– Attempted escapes and document falsification reinforced a picture of evasion rather than innocence.

– On November 16, 2023—about eighteen months after Mo’s death—Caitlyn Armstrong was found guilty of first-degree murder.
– She was sentenced to 90 years in prison for the cold-blooded killing of Mariah Wilson.

– What began with a panicked 911 call became a case of obsession, surveillance, and premeditation—threaded through a cycling community that never expected such violence in its midst.
– A high-value bike dumped nearby, a dark Jeep idling down a back alley, doorbell audio catching human terror in real time—each fragment sharpened into a whole that jurors could not ignore.
– In the end, Colin Strickland walked away legally cleared but marked by proximity; Kaitlyn Cash lived through a trauma no friend should face; and Mo Wilson’s life—full of talent and momentum—was cut short in the very city where she came to race.

The lights of Austin carried on after that night. But for everyone entangled in those final hours, time split in two—the world before the black Jeep turned down Maple Avenue, and the world after.