A father accused of killing his 14-year-old daughter’s rapist is running to be sheriff — claiming the legal system “failed” him by charging him with murder.

Aaron Spencer allegedly gunned down Michael Fosler, 67, after catching him driving off with his daughter, whom Foster had already been charged with grooming and abusing, according to court docs.

Spencer was charged with second-degree murder — spurring him to run to be sheriff in Lonoke County, Arkansas, he said Saturday in a Facebook video launching his campaign.

Aaron Spencer, who is accused of killing his daughter’s rapist, is running for sheriff in Arkansas. Aaron Spencer/Facebook

“I’m the father who acted to protect his daughter when the system failed,” Spencer said in the video.

“Through my own fight for justice, I have

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