The Rhode Island trans dad who slaughtered his ex and their son during a high school hockey game was obsessed with porn accounts on X — interacting with increased intensity ever since his sex change, a review of his social media revealed.

Robert Dorgan — the father of six who fatally shot his ex-wife and son Feb. 16 at a Rhode Island hockey game — followed numerous porn models on X, and regularly replied to their content.

Two days before the murders, Dorgan, who transitioned into a woman in 2020, replied online to an X-rated model who posted a nude photo of herself.

“Rate my booty,” the person, who goes by the name “Malloy” and bills herself as “da big ti–y queen,” wrote in the Valentine’s Day post.

Dorgan posted an emoji depicting the number 11.

In another explicit exchange, Dorgan answered a naked model’s Feb. 12 query, which featured a nude clip of herself with the question, “What turns you ON the most – Tits or my P–sy?”

“Hipps [sic],” he replied.

The volume of his pervy posting appears to have increased after he got his sex change in 2020.

Dorgan replied to hundreds of adult posts on X over the last two years, The Post found.

The former General Dynamics Bath Iron Works employee had a history of mental illness and domestic violence.

Dorgan’s transgender identity was a key reason behind his divorce from Rhonda, according to court records obtained by NBC 10.

Rhonda cited “gender reassignment surgery, narcissistic, personality traits,” as grounds for divorce when she filed in 2020, but later changed it to “irreconcilable differences.”

“I just want to make sure people understand this was one person’s vendetta against their family, we were targeted. This was very specific. It wasn’t random,” his daughter Amanda Wallace-Hubbard told WPRI Tuesday.