It happened in Mount Vernon, Washington on Saturday night. The Skagit County Sheriff's Office was called to a home on Big Lake Road about 5:25 p.m. for a report of a fight.
A second call came in a few minutes later with a man reporting that his friend had been shot.
Deputies found a 32-year-old woman dead in the driveway when they arrived at the home. The couple that lives there came out and spoke to the deputies, according to a news release.
Investigators say the victim and shooter didn't know each other but they determined that the incident began over the theft of a political sign.
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Police did not release information about the sign but other residents, but a reporter for Q13 confirmed it was a sign for Loren Culp a Republican who was running for governor. Posts on a local message board initially said the woman had a Trump sign in the yard and the victim tried to take it.
55-year-old Angela Marie Conijn was booked into the county jail on 2nd-degree murder charges. It was unclear if she had a lawyer who could speak on her behalf.
A 58-year-old man, who was reported to be Conijn's husband, was arrested on assault charges.
Police did not release the name of the victim. They said the investigation was ongoing.