Trans killer Robert Dorgan was an electrician at a Maine shipyard that builds Navy vessels — where he shocked co-workers by showing up in “inappropriate” miniskirts and heels.

The 56-year-old dad of six, who went by Roberta, was an employee at General Dynamics Bath Iron Works in Bath when he murdered his 23-year-old son, Aidan, and ex-wife, Rhonda, at a Rhode Island high school hockey game on Monday.

Dorgan was known for being “short-tempered” — and being an “odd bird” who showed up to work in “inappropriate clothing,” including short skirts and dresses, colleagues told the Providence Journal.

“How the hell could you wear high heels in a shipyard?” said Ryan Fisher, who worked with Dorgan for seven years.

He added that Dorgan was employed as an electric cable puller “because they had muscle.” 

Another co-worker, who didn’t want to be named, claimed Dorgan had only just shown off photos of his ex-wife and kids at the shipyard days before the shooting.

The employee said Dorgan, who referred to his ex as “my princess” and gave zero indication they were divorced, had gushed about how much he loved his family.

Still, he stressed that Dorgan had a reputation for being an “odd bird” and into guns.

A spokesperson for General Dynamics Bath Iron Works confirmed Dorgan was an active employee at the company.

“We extend our deepest sympathies to the victims, their families and all those affected by this tragedy,” the rep said in a brief statement to The Post.

Dorgan — who underwent gender reassignment surgery in 2020 — gunned down his ex-wife and eldest son and injured his former in-laws at the Pawtucket ice rink as they were all watching another son play on Monday afternoon.

Authorities said the killer’s exact motive was still unknown but he clearly harbored a deadly resentment against his family.