The incident unfolded around 4:30 p.m. local time and began as some sort of disagreement between two people aboard a northbound Green Line train near the Hatcher station, DART spokesperson Gordon Shattles said in a statement to CNN.
The gunfire broke out on a Green Line train near Hatcher Station during an argument.
DART police officers arrived on the scene and found two people suffering from gunshot wounds, one of them a bystander, and transported them to local hospitals, where one victim was pronounced dead.
The condition of the second victim is unknown. A third individual was also wounded by shrapnel and was treated at the scene. It is currently unclear whether the individuals knew each other prior to the shooting or what the argument involved.
DART police are searching for the shooter, whose identity is unknown. DART Green Line trains resumed normal operations hours after the shooting, but the bus shuttle remained canceled for the rest of the day.
The incident follows a deadly weekend for Texas, with a mass shooting at an outlet mall in Allen leaving eight dead, and another eight people killed when a car rammed a group of people outside a migrant shelter in Brownsville.
The attack came just weeks before Texas is set to mark a year since 19 students and two teachers were killed at Robb Elementary school in Uvalde.