The suspect was identified as Arcan Cetrin, 20, a resident of Oak Harbour, Washington, located about 28 miles southwest of Cascade Mall in Burlington, the Washington State Patrol said.
Police released his identity and mugshot on Saturday evening, ABC News reported.
The shooting occurred on Friday evening. Police said Cetrin entered the mall and opened fire roughly 10 minutes later in the makeup department of Macy's department store, police said.
Surveillance video images showed Cetrin, whom police originally described as Hispanic and in his late teens or early 20s, went into the mall without the rifle that he shortly after brandished in the department store.
Four women, were killed on the spot, and a man who had sustained life-threatening injuries died early Saturday morning, said Sgt. Mark Francis of the Washington State Patrol.
Police have said they believe Cetrin acted alone, and the Federal Bureau of Investigation said it had no indication that the shooting was linked to terrorism.
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