An ex-partner of Rachel Morin — the Maryland mother of five who was raped and murdered by an illegal migrant in a case that gripped the country and evoked political debate — was arrested Tuesday on child pornography charges.

Matthew McMahon, the father of Morin’s eldest daughter, was apprehended at his home in the Old Line State on Tuesday, WMAR 2 reported.

McMahon, who was famously vocal about supporting Morin’s children during her killer’s trial, had been the subject of a child porn investigation headed by the Harford County Child Advocacy Center since September, the outlet reported.

Investigators allegedly traced multiple explicit videos and images involving children as young as 5 to McMahon’s computer.

One video allegedly found on his computer showed a young girl performing s

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