A customer shot and killed a hatchet-wielding man attacking a clerk at a convenience store in Burien Sunday morning.

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Update at 3:34 p.m. Monday: The King County Medical Examiner’s Office has identified the man who was fatally shot as Steven Blacktongue, 43.

Original story: A customer shot and killed a hatchet-wielding man attacking a clerk at a convenience store in Burien on Sunday morning.

About 5:45 a.m., a masked man about 40 years old walked into a 7-Eleven store near South 110th Street and Eighth Avenue South and swung a hatchet at a customer, said King County Sheriff’s Sgt. Cindi West. The man then went behind the counter and attacked the 58-year-old clerk, never saying anything.

Within seconds, a customer pulled out a handgun and shot and killed the attacker, likely saving the clerk’s life, West said. He was pronounced dead at the scene.

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The 60-year-old customer buys coffee from the store almost every morning, West said, and he sits and chats with the clerks. He has a permit to carry a concealed handgun, West said.

The clerk who was attacked told a KIRO 7 reporter that he would have been killed had it not been for the customer. The regular customer is a “very nice” guy, the clerk said.

The clerk has a minor injury on his stomach, West said.

The identities of the three people involved were not released.

An investigation is continuing.