CapMetro Police identify man accused of stabbing victim three times on bus in NE Austin

Authorities search for Sergio Diaz, 45, after alleged attack on public transit bus

Published on Feb. 9, 2026

Police in Austin, Texas are searching for a 45-year-old man named Sergio Diaz who is accused of stabbing a passenger three times on a CapMetro bus in northeast Austin in late January. Authorities obtained an arrest warrant for Diaz on charges of aggravated assault with a deadly weapon after reviewing video footage of the incident and matching it to Diaz's identification.

Why it matters

Incidents of violence on public transportation are concerning for both rider safety and the overall perception of transit system security. This case highlights the need for robust safety protocols and monitoring on buses to protect passengers, as well as the challenges law enforcement faces in quickly identifying and apprehending suspects in these types of mobile, crowded environments.

The details

According to the arrest affidavit, the stabbing occurred on Saturday, January 24 around 4 p.m. on CapMetro bus #2706 near 7900 Cameron Rd. Video footage shows Diaz allegedly standing up from the middle of the bus and walking to the back, where he reportedly attacked the victim with a knife. The victim sustained two stab wounds to the upper left back and one to the upper left chest. After receiving treatment at a hospital, the victim expressed intention to pursue charges against Diaz.

  • The incident occurred on Saturday, January 24 around 4 p.m.
  • CapMetro Police obtained an arrest warrant for Diaz on February 6th

The players

Sergio Diaz

A 45-year-old man accused of stabbing a passenger three times on a CapMetro bus in northeast Austin.

CapMetro

The public transportation agency serving the Austin, Texas metropolitan area.

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What’s next

The judge will decide on whether to grant bail for Sergio Diaz at a hearing on February 15th.

The takeaway

This case underscores the importance of robust safety protocols and monitoring on public transit systems to protect passengers, as well as the challenges law enforcement faces in quickly identifying and apprehending suspects in these types of mobile, crowded environments.