Campus Alert Archive
Trinity

The Cheerleader Who Missed the Meeting: Trinity University's Cayley Mandadi and the Texas CLEAR Alert Law That Followed

TXmissing personmissing studentmedium confidence
Confirmed Threat

On October 29, 2017, Trinity University) sophomore and cheerleader Cayley Mandadi, 19, failed to appear at a weekly sorority meeting in San Antonio. Friends and family were unable to reach her. She was found unresponsive in a vehicle on a South Texas highway on October 30, was declared brain dead, and died October 31, 2017. Her boyfriend Mark Howerton was charged with kidnapping, sexual assault, and murder. The case directly inspired the Texas CLEAR Alert law for missing adults signed in 2019.

Alerts
2
Response
—
Killed
1
Injured
0
Institution
Trinity University
Private Liberal Arts · TX
~2,500 studentsTiger Alert
Confirmed Timeline

Alert Sequence

2 messages in sequence

Some alert texts below are approximate reconstructions from news coverage, not confirmed verbatim transcripts. Reconstructed texts are shown in italic with a dashed border. Verified verbatim texts have a solid border and are marked accordingly.

INITIAL ALERTEmail
Approximate reconstruction436 chars
Trinity University Public Safety is assisting the San Antonio Police Department in efforts to locate Trinity student Cayley Mandadi, 19. Cayley was last seen Sunday, October 29, 2017. She is described as a white female, 5'6", 125 pounds, with blonde hair and blue eyes. If you have seen Cayley or have any information about her whereabouts, please contact Trinity Public Safety at (210) 999-7070 or San Antonio Police at (210) 207-7273.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed; Trinity University did not publish an archive of this specific notification and sources confirm a missing-person communication was distributed when Mandadi could not be located
Mandadi had last been seen at a Halloween party in Houston with her boyfriend Mark Howerton before disappearing on October 29; the notice describes what her campus knew at that point
Trinity University Public Safety serves an 800-student residential campus embedded in San Antonio's Alamo Heights neighborhood; the tight residential community meant Mandadi's absence was quickly flagged by sorority sisters
FOLLOW-UPEmail
Approximate reconstruction532 chars
Trinity University community: We received the heartbreaking news that our student Cayley Mandadi passed away yesterday. We are devastated by this loss. Trinity Public Safety, working with SAPD, is asking the campus community to be on the lookout for Mark Howerton. Howerton is not a Trinity student and is not welcome on campus. If you see him on or near campus, please contact Trinity Public Safety immediately at (210) 999-7070. Additional counseling support is available through the Health Center. We grieve with Cayley's family.

This text has been reconstructed from news coverage and may not reflect the exact original wording.

Reconstructed; Trinity confirmed it issued this type of campus notice to alert students and faculty to be on the lookout for Howerton, who was not a Trinity student
The communication identifying a specific non-campus person as a threat is a legally significant campus-safety step, permitting Trinity security to trespass Howerton from campus property
Mandadi's death and the failure of friends' earlier welfare-check requests directly motivated Texas legislators to pass the 2019 CLEAR (Coordinated Law Enforcement Adult Response) Alert law, which now functions as a Silver Alert equivalent for missing adults under 65 in Texas
Context

Background

Cayley Mandadi was a 19-year-old sophomore cheerleader at Trinity University), a private liberal arts university in San Antonio, Texas. She was last seen at a Halloween party in Houston on October 29, 2017, traveling with her boyfriend Mark Howerton. When she failed to appear at a sorority meeting that evening, friends attempted a welfare check, but their efforts to file a missing-person report were initially turned away because Texas had no formal mechanism for reporting missing adults between 18 and 65 years old. She was found unresponsive the following day on Interstate 35 in a vehicle driven by Howerton. She was declared brain dead on October 30 and died October 31. A medical examiner found evidence of sexual assault and blunt force trauma. Howerton was charged with capital murder, kidnapping, and sexual assault; he was acquitted of murder in a 2019 trial but convicted of sexual assault. Mandadi's mother used the case to advocate for the CLEAR Alert law, signed by Governor Greg Abbott in September 2019, which created a statewide notification system for missing adults -- filling the gap that prevented friends from getting timely law enforcement help on October 29, 2017.
Analysis

Key Findings

Texas had no adult missing-person alert system at the time of Mandadi's disappearance; friends' early welfare-check requests were turned away, a legal gap the CLEAR Alert law (2019) was designed to close
Trinity University's follow-up notice identifying Howerton by name and barring him from campus is an example of a Clery-adjacent community notification that served both safety and legal purposes
The three-day interval from last contact (October 29) to death (October 31) illustrates how quickly campus welfare emergencies can escalate to fatalities without effective cross-jurisdiction alert infrastructure
The Cayley Mandadi case became the founding narrative for Texas CLEAR Alert advocacy and is frequently cited in campus crisis management training as a failure-mode scenario
Outcome
Mandadi died on October 31, 2017. Mark Howerton was charged with capital murder, kidnapping, and sexual assault. After a 2019 trial, he was acquitted of murder but convicted on sexual assault charges. Her mother subsequently founded the Cayley Mandadi Foundation to advocate for domestic violence survivors.
Provenance

Sources

  1. News
    Questions surround death of Trinity University cheerleader (News 4 San Antonio)
    news4sanantonio.com
  2. News
    Death of Trinity University student under investigation (KSAT)
    ksat.com
  3. News
    Cayley Mandadi's mother uses grief for good with CLEAR Alert law for missing adults in Texas (CBS News)
    cbsnews.com
  4. News
    Cayley Mandadi's family sues Trinity University, claims school's negligence led to her death (KENS5)
    kens5.com
  5. Official
    Mourning the Loss of a Trinity Student (Trinity University)
    trinity.edu
Tags
missing-studentmissing-personprivate-liberal-artstexasintimate-partner-violencedomestic-violenceclear-alertwelfare-checkhomicidepolicy-impact
Added May 2026Updated May 2026Via ingestion