Police have taken a male suspect into custody.

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A woman died after being stabbed multiple times at the Seattle Center Armory around 4:19 p.m. Friday, according to the Seattle Police Department.

Police arrested a man nearby who they say was in a relationship with the victim. The woman, who is around 30 years old, was transported to Harborview Medical Center in critical condition. Harborview confirmed she died of her wounds a few hours later. (The King County Medical Examiner’s Office will announce the exact time and official cause of death when they complete their autopsy.)

According to Seattle police, the man, woman and their 4-year-old son were together at The Armory when the couple got into an argument and the man stabbed the woman.

The man fled on foot and a witness followed him “in an attempt to foil his escape,” police said in an online statement. Police then found the witness and suspect near Fifth Avenue and Broad Street. Officers arrested the man and recovered a knife, the department said. Police took the 4-year-old boy into their care and began coordinating with Child Protective Services.

Video posted by Q13 Fox on Friday night appeared to show a man in Seattle Center pointing a gun at the suspect and urging him to put down a knife. In the video, another bystander appears to pepper spray the suspect. Seattle Police Department spokesman Sean Whitcomb confirmed that the witness who followed the suspect after the stabbing was legally armed with a handgun, but did not know further details.

A spokeswoman for Seattle Center declined to comment.

Staff reporter Asia Fields contributed.