A 24-year-old man has died after trying to pull a distraught teenager away from a window ledge.
The incident occurred on Sunday at the University of Hawaii in Honolulu.
Both men fell from the 14th floor and were critically injured, police said in a statement. They were taken to a hospital, where the older man was pronounced dead.
A 19-year-old man remains in critical condition, police said.
Students are planning to start moving into their housing on Tuesday, a university spokesman said.
Counseling is available for students at the Manoa campus, and in the coming weeks, staff will be checking on those living in the dorm where the two men fell, Dan Meisenzahl said.
Neither man was a University of Hawaii student but came to the dorm when a student who lived there had people over, Meisenzahl said. Their names were not released.
The school is investigating whether any violations of the student code occurred, Meisenzahl added.
"It's a terrible tragedy - the last thing we want to happen ... whether they are students or not," he said. "Of course, our condolences go out to their friends and family."
The school year has not started yet, so only about 20 students - those in need of transitional housing between the summer and fall semesters - were living in the two towers that make up the Hale Wainani dorm.
During the school year, the dorm houses more than 600 students. Those arriving for the upcoming semester are scheduled to move in to the dorms Tuesday and Friday.
On Monday afternoon, there were mostly maintenance workers and cleaning staff outside the dorm getting ready for students to move in.
The university's flagship campus in Honolulu's Manoa neighborhood is generally a commuter school without much of a fraternity scene, Meisenzahl said. About 4,000 of its 18,000 students live in campus housing.
Useful websites and helplines:
- Samaritans, open 24 hours a day, on 08457 90 90 90
- Mind, open Monday to Friday, 9am-6pm on 0300 123 3393
- Get Connected is a free advice service for people under 25. Call 0808 808 4994; email: firstname.lastname@example.org or visit the website getconnected.org.uk
- Young Minds offers information to young people about mental health and emotional wellbeing
- HopeLine runs a confidential advice helpline if you are a young person at risk of suicide or are worried about a young person at risk of suicide. Mon-Fri 10-5pmand 7pm-10pm. Weekends 2pm-5pm on 0800 068 41 41
- HeadMeds - a straight-talking website on mental health medication