Cory Lamar Jones, the man police say opened fire on a DART platform earlier this week, did not committ suicide, officials say.
Jones was shot and killed during a gun battle with DART police officers Tuesday after he opened fire and killed one person at the Arapaho Center station moments before.
Jones' death was classified a homicide Thursday following an examination by the Dallas County medical examiner.
Investigators said Jones, 27, got into a disagreement with a DART bus driver over a ticket. The bus driver reported the incident to a transit officer, Nikisha Manderson.
When Jones spotted the driver talking to the officer, he got off of the bus and headed for the train platform. When Manderson tried to get Jones' attention, he turned, pulled out a weapon and started shooting.
Jones struck the officer once in the vest and the she returned fire.
Caught in the crossfire were 42-year-old Eric Thomas Johnson, who was killed by Jones, and Russell Weinstein, who was injured after being shot by Manderson, Weinstein said.
Jones then fled to an adjacent warehouse where he got into a second exchange of gunfire with three DART officers.
After the shooting subsided, officers found Jones with an apparent bullet wound to the head. Investigators were not able to determine at the scene if Jones' wound was self-inflicted or if an officer shot him.