Transcript for Police trying to figure out what sparked deadly Seattle shooting spree
Next, to the deadly rampage in Seattle. A gunman firing at random in his own neighborhood. A bus driver among his victims but he still managed to get his passengers to safety. Tonight, he is hailed a hero. Tonight, the hunt for answers and what place V police are calling a random, senseless act. Here's ABC's will Carr. Reporter: Tonight, investigators are trying to figure out what sparked this trail of terror that left two dead. A male running with a gun and someone saw him shooting something. Reporter: This is the man in custody tonight. Authorities say this man, 33-year-old tad Michael Norman went on a shooting spree in the Seattle neighborhood where he lives. He was firing walking up the street, firing and I jumped into my bushes. My bushes. Reporter: Police say the suspect first shot school teacher Deborah Judd. He looked me right in the eyes and just shot, said nothing. Reporter: Then allegedly turning on a nearby bus. He got into a shooting stance and he fired a shot, and struck me in the chest. Reporter: Injured bus driver Eric stark is being called a hero after he drove his bus riddled with bullets to safety and alerted authorities. Did like a two second assessment on my injuries and figured, well, I can breathe, I can think, I can see, and I can talk. So for me, that was enough to go, okay, we're getting out of here, I got to get these people out of there. Reporter: But the rampage continued. The gunmen then allegedly shot and killed the driver of this red prius, took off in the vehicle and crashed into a separate car, killing that driver. Tonight, that suspect is facing charges of homicide, robbery and assault. Will Carr now, the suspect arrested after a brief stand off. He is expected to appear in court tomorrow. The police have not yet revealed a motive? Reporter: That's right. The big question now is why? Authorities are pouring into the suspect fast. Tonight, the two victims who survive ready still in the hospital and expected to recover including the bus driver. A hero. Thank you.
This transcript has been automatically generated and may not be 100% accurate.