The events leading up to the fracas include a weird sting operation at Parrott's Paoli, Indiana trailer where Parrot and his stepdaughter (not to be confused with Heimbach's stepdaughter mentioned above) set out to ambush Heimbach trying to sleep with Parrott's wife after Heimbach claimed that the three-month affair had ended.
Police said Parrott, 36, called 911 from a Walmart near his home to report that Heimbach attacked him.
WHAS-TV reports that arrest records show Heimbach, who spoke at the University of Tennessee in Knoxville last month, assaulted his wife's stepfather Matt Parrott, who also serves as a top spokesman for Heimbach's Traditionalist Worker Party.
Heimbach faces four charges including strangulation, intimidation, battery and domestic battery committed in the presence of a child.
On Tuesday, Parrott announced he was walking away from the group, telling the SPLC, "I'm done".
The officer heard a scuffle and ran into the home - finding a "visibly upset" Brooke clutching one of her children, according to the arrest documents. Not long after, Parrott "threw a chair at [Heimbach] to make him leave and [Heimbach] proceeded to then choke him again in the same manner as before".
"He grabbed and injured my hand after I poked his chest then choked me out with his arm", Parrott said in a handwritten statement to police.
The incident happened at the Paoli property where Heimbach and other members of the Traditionalist Worker Party live.
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He was released after posting his $1,000 bond.
Tuesday's arrest isn't the first time Heimbach has gotten in trouble with the law.
The Traditionalist Worker Party "advocates for racially pure nations and communities and blames Jews for numerous world's problems", according to the Southern Poverty Law Center, which labels it as a hate group. Matt Parrott is out of the game.
Matthew Heimbach made headlines in 2016 for assaulting a black protester at a campaign rally for Donald Trump. "Y'all have a nice life".
Days before the drama unfolded, Parrott posted a message on the alt-right media platform Gab saying he was distancing himself from the Traditionalist Worker Party. 'My focus from here on out will be exclusively infrastructure and logistics'.
Likewise, with the arrest - and the affair - it appears the Traditionalist Worker Party may have collapsed entirely. The group, according to its Facebook page, focuses on the interests of white Americans who "for decades have been abandoned by the System and actively attacked by globalists and traitorous politicians".
Heimbach followed Parrott into the house.