A man has died after he was stabbed at the Ronstadt Transit Center early Saturday morning, according to a news release from the Tucson Police Department.
The man has been identified as 38-year-old Joseph Robert Lundberg.
On Monday, detectives located and interviewed a man who was involved in the incident.
No arrest has been made as of Tuesday evening.
Just after 12:30 a.m. on Sunday, officers and members from the Tucson Fire Department responded to the RTC for a report of an injured man on the ground.
As authorities arrived, they found Lundberg near a bus bench with obvious signs of trauma.
Tucson Fire immediately began treatment on Lundberg, however, he succumbed to his injuries and was pronounced dead at the scene.
Detectives responded to the scene to continue the investigation and were able to determine that the victim and an unidentified man were involved in a physical confrontation near the bus benches an hour before they arrived.
Police say during the confrontation, the suspect stabbed Lundberg and fled the area northbound on foot.
Detectives say other people were in the area at the time of the stabbing and may have seen what happened.
If you have any information on this incident you are encouraged to call 9-1-1 or 88-CRIME, you can remain anonymous.
Homicide Detectives investigating a fatal stabbing-215 E. Congress at the RTC. Anyone w/info is asked to call 911 or 88-CRIME. pic.twitter.com/BQYpPXaaN8
— Sergeant Pete Dugan (@SgtDugan) November 19, 2016
The investigation is still ongoing at this time.