{
  "id": "2025-09-18-university-of-michigan-construction-site-stabbing",
  "slug": "university-of-michigan-construction-site-stabbing-2025-09-18",
  "institution": {
    "name": "University of Michigan",
    "shortName": "U-M",
    "state": "MI",
    "type": "public-r1",
    "alertSystemName": "U-M Emergency Alert",
    "alertPlatform": "Rave",
    "enrollment": 52000
  },
  "incident": {
    "date": "2025-09-18",
    "type": "stabbing",
    "cleryCategory": "emergency-notification",
    "resolution": "confirmed-threat",
    "headline": "Worker stabbed at a construction site; suspect arrested after a five-hour manhunt",
    "headlinePublic": "Worker stabbed at a construction site; suspect arrested after a five-hour manhunt",
    "summary": "Around 6:20 PM EDT on September 18, 2025, [a man was stabbed at the Kahn Health Care Pavilion construction site](https://www.dpss.umich.edu/news-and-alerts/emergency-alerts/media-release-stabbing-near-catherine-street-and-zina-pitcher-place/) on the University of Michigan medical campus after the suspect was denied entry. U-M Emergency Alert sent two messages (initial at 6:20 PM EDT and a suspect-description follow-up at 7:11 PM EDT) and the suspect, [Lagarien Thomas, 33, was arrested at 11:34 PM EDT](https://www.campussafetymagazine.com/news/university-of-michigan-stabbing-incident-suspect-apprehended-following-manhunt/173590/) after a five-hour Ann Arbor manhunt.",
    "outcome": "Lagarien Thomas, 33, was arrested by Ann Arbor Police at approximately 11:34 PM EDT on September 18, 2025. The victim, a construction worker, was transported with non-life-threatening injuries.",
    "casualties": {
      "killed": 0,
      "injured": 1
    }
  },
  "alerts": [
    {
      "sequence": 1,
      "type": "initial",
      "timestamp": "2025-09-18T18:21:00-04:00",
      "channel": "twitter-x",
      "verbatimText": "UM EAlert\n Ann Arbor: 6:21pm Stabbing occurred Catherine/Zina Pitcher. Avoid Area. Updates: http://dpss.umich.edu",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://x.com/umichdpss/status/1968802912575914334",
      "sourceDescription": "@umichdpss on X (verbatim)",
      "annotations": [
        "Verbatim text of the UM EAlert sent at 6:21 PM EDT on September 18, 2025, pushed simultaneously via SMS, email, and X",
        "DPSS uses minimalist 'EAlert' text (under 160 characters) so the SMS variant fits in a single message and includes a link for updates",
        "The Catherine Street and Zina Pitcher Place intersection sits at the heart of the U-M Medical Campus next to the Kahn Pavilion construction site",
        "Corrected to exact fxtwitter display text."
      ],
      "characterCount": 113
    },
    {
      "sequence": 2,
      "type": "update",
      "timestamp": "2025-09-18T19:11:00-04:00",
      "channel": "sms",
      "verbatimText": "Update #1: 7:11 p.m. Stabbing suspect: Heavyset Black male in white shirt, tie, jeans. Call 911 if seen.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://dpss.umich.edu/news-and-alerts/emergency-alerts/u-m-emergency-alert-9-18-25/",
      "sourceDescription": "U-M DPSS Emergency Alert 9/18/25 archive",
      "annotations": [
        "Exact Update #1 text from official U-M DPSS emergency-alert archive (7:11 p.m. suspect description)",
        "Suspect description came from witnesses at the Kahn Pavilion construction site after the assailant fled"
      ],
      "characterCount": 104
    },
    {
      "sequence": 3,
      "type": "update",
      "timestamp": "2025-09-18T19:36:00-04:00",
      "channel": "sms",
      "verbatimText": "Update #2: 7:36 p.m. Photo of suspect has been released. It may be found on DPSS X and Facebook accounts. Police asking for community to be alert and call 911 you see the individual.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://dpss.umich.edu/news-and-alerts/emergency-alerts/u-m-emergency-alert-9-18-25/",
      "sourceDescription": "U-M DPSS Emergency Alert 9/18/25 — seq 3",
      "annotations": [
        "Exact line from official DPSS emergency-alert archive"
      ],
      "characterCount": 182
    },
    {
      "sequence": 4,
      "type": "update",
      "timestamp": "2025-09-18T20:33:00-04:00",
      "channel": "sms",
      "verbatimText": "Update #3: 8:33 p.m. Continue to avoid the location near Zina Pitcher and Catherine. DPSS is clearing the surrounding area.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://dpss.umich.edu/news-and-alerts/emergency-alerts/u-m-emergency-alert-9-18-25/",
      "sourceDescription": "U-M DPSS Emergency Alert 9/18/25 — seq 4",
      "annotations": [
        "Exact line from official DPSS emergency-alert archive"
      ],
      "characterCount": 123
    },
    {
      "sequence": 5,
      "type": "update",
      "timestamp": "2025-09-18T22:21:00-04:00",
      "channel": "sms",
      "verbatimText": "Update #4: 10:21 p.m. Alleged suspect Lagarien Thomas, 33, not found. Police in area. Remain alert.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://dpss.umich.edu/news-and-alerts/emergency-alerts/u-m-emergency-alert-9-18-25/",
      "sourceDescription": "U-M DPSS Emergency Alert 9/18/25 — seq 5",
      "annotations": [
        "Exact line from official DPSS emergency-alert archive"
      ],
      "characterCount": 99
    },
    {
      "sequence": 6,
      "type": "update",
      "timestamp": "2025-09-18T22:52:00-04:00",
      "channel": "sms",
      "verbatimText": "FINAL UPDATE: 10:52 p.m. Area canvassed. Investigation ongoing. Stay alert.",
      "isVerbatimConfirmed": true,
      "sourceUrl": "https://dpss.umich.edu/news-and-alerts/emergency-alerts/u-m-emergency-alert-9-18-25/",
      "sourceDescription": "U-M DPSS Emergency Alert 9/18/25 — seq 6",
      "annotations": [
        "Exact line from official DPSS emergency-alert archive"
      ],
      "characterCount": 75
    },
    {
      "sequence": 7,
      "type": "all-clear",
      "timestampApprox": "After 11:34 PM EDT arrest on September 18, 2025 (per DPSS archive note)",
      "channel": "sms",
      "verbatimText": "Note: Suspect was arrested at 11:34 pm. There is no threat to the campus at this time. Investigation ongoing.",
      "isVerbatimConfirmed": true,
      "sourceDescription": "U-M DPSS Emergency Alert 9/18/25 archive",
      "annotations": [
        "Exact arrest/all-clear notice text from official U-M DPSS emergency-alert archive page",
        "Lagarien Thomas, 33, arrested by Ann Arbor Police at approximately 11:34 PM EDT"
      ],
      "characterCount": 109,
      "sourceUrl": "https://dpss.umich.edu/news-and-alerts/emergency-alerts/u-m-emergency-alert-9-18-25/",
      "timestamp": "2025-09-18T23:34:00-04:00"
    }
  ],
  "context": "On the evening of Thursday, September 18, 2025, a man attempted to enter the [D. Dan and Betty Kahn Health Care Pavilion construction site](https://www.cbsnews.com/detroit/news/university-of-michigan-issues-emergency-alert-over-stabbing-on-campus/) on U-M's medical campus near the intersection of Catherine Street and Zina Pitcher Place. After being denied entry, [Lagarien Thomas, 33](https://www.fox2detroit.com/news/university-michigan-stabbing-has-police-searching-suspect), allegedly stabbed a construction worker and fled. U-M's Division of Public Safety and Security issued an [emergency alert at approximately 6:20 PM EDT](https://www.dpss.umich.edu/news-and-alerts/emergency-alerts/media-release-stabbing-near-catherine-street-and-zina-pitcher-place/), followed by a suspect-description update at 7:11 PM EDT after witnesses provided more detail. Ann Arbor Police led a [five-hour manhunt](https://www.campussafetymagazine.com/news/university-of-michigan-stabbing-incident-suspect-apprehended-following-manhunt/173590/) and arrested Thomas at 11:34 PM EDT. The victim survived with non-life-threatening injuries. The incident drew renewed attention to construction-site security on the medical campus and to U-M's use of layered alert updates rather than single mass notifications during evolving threats.",
  "keyFindings": [
    "U-M's three-message alert pattern (initial, suspect description, all-clear) is consistent with DPSS emergency-notification protocol for active suspects",
    "The 51-minute gap between the initial alert and the suspect-description update reflects the time required to obtain a usable description from witnesses",
    "The case shows the value of geographically specific alerts: the initial message named the exact intersection rather than a generic 'medical campus' designation",
    "U-M Emergency Alert remained active for roughly 5 hours and 14 minutes from initial alert to all-clear"
  ],
  "responseTimeMinutes": 1,
  "sources": [
    {
      "title": "MEDIA RELEASE: Stabbing Near Catherine Street and Zina Pitcher Place (DPSS)",
      "url": "https://www.dpss.umich.edu/news-and-alerts/emergency-alerts/media-release-stabbing-near-catherine-street-and-zina-pitcher-place/",
      "type": "official-archive"
    },
    {
      "title": "U-M Emergency Alert 9/18/25 (DPSS)",
      "url": "https://dpss.umich.edu/news-and-alerts/emergency-alerts/u-m-emergency-alert-9-18-25/",
      "type": "official-archive"
    },
    {
      "title": "Suspect in custody after one person stabbed on University of Michigan campus (CBS Detroit)",
      "url": "https://www.cbsnews.com/detroit/news/university-of-michigan-issues-emergency-alert-over-stabbing-on-campus/",
      "type": "local-media"
    },
    {
      "title": "University of Michigan Stabbing Incident: Suspect Apprehended Following Manhunt (Campus Safety Magazine)",
      "url": "https://www.campussafetymagazine.com/news/university-of-michigan-stabbing-incident-suspect-apprehended-following-manhunt/173590/",
      "type": "local-media"
    },
    {
      "title": "University of Michigan stabbing suspect arrested (FOX 2 Detroit)",
      "url": "https://www.fox2detroit.com/news/university-michigan-stabbing-has-police-searching-suspect",
      "type": "local-media"
    },
    {
      "url": "https://x.com/umichdpss/status/1968802912575914334",
      "title": "@umichdpss on X",
      "type": "official-archive",
      "dateAccessed": "2026-07-18"
    }
  ],
  "confidence": "high",
  "tags": [
    "stabbing",
    "michigan",
    "public-r1",
    "medical-campus",
    "manhunt",
    "construction-site",
    "u-m-emergency-alert"
  ],
  "dateAdded": "2026-05-03",
  "lastUpdated": "2026-07-19",
  "addedBy": "ingestion"
}