Slain Maryland mom Rachel Morin’s ex accused of possessing child porn

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 sexual acts on an adult man, CBS News reported.

At least 10 files of young girls between the ages of 5 and 14 years old engaging in various sexual acts were recovered from McMahon’s computer, according to charging documents obtained by the outlet.

McMahon shared an adult child with Morin, who was found dead on the Ma & Pa Trail in Bel Air, Maryland in 2023.

She had been stripped naked with her head “smashed in.” There was a roughly 20-foot trail of her blood leading to the drainage culvert where her body was ditched.

Nearly one year after Morin’s murder, authorities arrested Victor Martinez-Hernandez, a suspected gang member from El Salvador. He was sentenced to life in prison without the possibility of parole in August 2025.

When he was informed that Morin’s murder suspect had been caught, McMahon talked to the press about returning to the trail where his ex was murdered and detailed the little ways he’d attempted to reclaim it for her family.

“I brought flowers and placed them on the rock at the trailhead, and I took down the flyers with Victor’s sketch,” McMahon tearfully told Fox 45 News near the spot where the body of his former flame was found.

During the trial, McMahon stood by Morin’s family and her five children, including their 20-year-old daughter Faye.

When Martinez-Hernandez’s arrest was announced, Faye was expecting her first child, a girl — and Morin’s first grandchild.

“Faye should be able to give Rachel that news, to tell Rachel you’re going to be a grandmother. But she can never give that news,” McMahon said at the time.

Morin’s other children range in age from 9 to 15 years old.

Each child presented their own testimony during Martinez-Hernandez’s sentencing. Faye led the pack and was the only one to have her statement read by prosecutors inside the courthouse. The younger ones submitted audio recordings.

Faye described her mother as a “kind, strong, honest, determined and funny” person who had the “best laugh.”

“She was a good mom. Every time I see a picture of her, I think about the life I had with her and my four sisters. I miss her,” Morin’s only son said in his recording.

McMahon is being held in the Harford County Detention Center without bond. His trial is scheduled for January, according to court records.