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.

“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 seen firsthand the failures in law enforcement and in our circuit court. And I refuse to stand by while others face these same failures,” he continued.

He described his bid as an attempt to restore trust in law enforcement.

“This campaign isn’t about me; it’s about every parent, every neighbor, every family who deserves to feel safe in their homes and in their community. It’s about restoring trust, where neighbors know law enforcement is on their side and families know they will not be left alone in a moment of need,” he said.

Spencer was charged with second-degree murder last October after allegedly killing Fosler when he found him in a truck with his daughter, court documents show.

The dad told authorities he had driven around his neighborhood after discovering his daughter was missing — then found her being driven away by Fosler, who had already been charged with multiple sexual offenses against Spencer’s daughter.

He forced the accused rapist off the road and shot him, the documents stated.

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Spencer’s wife, Heather, launched an online fundraiser for her husband, saying their underage daughter had been “targeted, groomed and ultimately raped by the boyfriend of a family friend.”

“We let the justice system do its job. The monster who hurt our child was charged quickly, but released even faster on a $50k bond. He was awaiting court in December for several felonies in relation to what he did to our child,” she added.

She called the charges against her “hero” husband “outrageous,” adding that her “child would have not come home if my husband hadn’t found her.”

Spencer is next due in court on Dec. 16 for a pre-trial date, with his trial set to begin Jan. 26, 2026.

His campaign announcement video was bombarded with support.

“Proud to call this man my father!” his son Malachi Spencer wrote.

“If I could vote for you a million times, I would,” another supporter added.