CU Boulder Student Killed in Halloween Shooting: Police Seek Information After Marine Street Tragedy

A 19-year-old University of Colorado Boulder student has died and another student remains critically injured after a shooting at a Halloween gathering in Boulder, Colorado, late on October 31, 2026. The incident has deeply affected the university community, with police appealing for witnesses and information as investigators work to establish what happened.

According to the Boulder Police Department, officers responded at approximately 11:28 p.m. to reports of gunfire at a home in the 700 block of Marine Street, in the University Hill neighbourhood. They found two 19-year-old men with gunshot wounds. Both were taken to hospital, where one later died. The second victim remained in critical condition in the department’s November 1 update.

What Happened at the CU Boulder Halloween Gathering?

Police said officers had visited the residence earlier that evening following a noise complaint about a large party. The people living at the home were cited for a nuisance party, and the gathering ended, with hundreds of attendees leaving. A smaller group reportedly remained inside.

Investigators believe a group later attempted to force its way into the house. A confrontation followed, and shots were fired inside, striking the two students. Detectives have interviewed approximately 20 witnesses as part of the investigation.

Victims’ Identities and University Community Response

As of the police statement, the deceased student’s identity had not been publicly released. The Boulder County Coroner’s Office was expected to identify him. Police confirmed that both victims were male CU Boulder students, each aged 19. The name of the injured student was also not released.

The university acknowledged the trauma caused by the shooting and expressed sympathy for the students, families, faculty and staff affected. CU Boulder also directed people impacted by the incident to its Office of Victim Assistance for confidential support.

Boulder Police Investigation and Appeal for Witnesses

Investigators released images of two men they want to identify and speak with in connection with the shooting. Police described them as persons of interest, not formally identified suspects. Authorities are also seeking additional witnesses, including people who attended the gathering or may have recorded video or taken photographs nearby.

Anyone with information is asked to contact Boulder Police at 303-441-3333, referencing case 26-10148. Photos and videos can also be submitted through the department’s online evidence portal.

The shooting has left the CU Boulder community grieving and awaiting answers. As the investigation continues, thoughts remain with the family of the student who died, the injured young man and everyone affected by the violence.