HEAVILY armed, a US Coast Guard obsessed for years with an attractive former co-worker, a lesbian who married another female co-worker, tracked down where she lived and shot her dead, seriously wounding her partner.

US Coast Guardsman Adrian Loya, armed with two rifles, a 9mm handgun and a shotgun stormed Cape Cod Coast Guard Petty Officerss Anna and Lisa Trubnikova’s home in Bourne, Massachusetts.

Lisa Trubnikova, 31, was killed and her 30-year-old spouse, Anna Trubnikova, was seriously wounded.

Loya, 31, of Chesapeake, Virginia, allegedly set a car on fire to hamper police, planted fake bombs and opened fire on police officers when they arrived at the condominium complex.

Police officer, Jared MacDonald, was shot in the back, below his flack vest. MacDonald’s family said in a statement released by Rhode Island Hospital in Providence, said he was doing well but faces a long recovery.

Lisa Trubnikova’s relatives told the Boston Globe that Loya had been pursuing Lisa Trubnikova for years, beginning when Loya was stationed with the two women in Kodiak, Alaska.

“He became obsessed,” one family member told the paper. “He was fixated on her.”

After the couple moved to Cape Cod, Loya continued to pursue her romantically, although she showed no interest, relatives said.

Loya, of Coast Guard Base Portsmouth, Virginia, is believed to have driven to Massachusetts earlier in the week and rented a motel room near the couple’s condo complex.

He pleaded not guilty to charges including murder, attempted murder and assault and battery of a police officer. He has been ordered to undergo a psychiatric evaluation.

Prosecutor Michael O’Keefe said police are investigating Loya’s computer records. A significant amount of planning went into his alleged attack, O’Keefe said.

Her older brother Luis Berlanga said the attack was clearly calculated, and that Loya should be held criminally responsible.

“He wasn’t crazy,” he said. “He knew what he was doing.”

Berlanga said his sister was stationed in Alaska when she began dating Anna Trubnikova, whom she first met at a recruitment office in New Orleans. They were a perfect match, he said.

“You couldn’t imagine two people who were better for each other,” he said. “They were so close. When they walked into a room, it lit up.”

They married in New York a couple of years ago, he said, and moved to Bourne together. Lisa Trubnikova was stationed at Joint Base Cape Cod in Bourne, and Anna Trubnikova was stationed at Woods Hole.

Rear Admiral Linda Fagan offered her thoughts and prayers for the families, friends and loved ones of those affected by the shooting.

“We extend our heartfelt thanks to those in the community and the Coast Guard family who stand alongside us as we mourn the tragic loss of Petty Officer (2nd Class Lisa Trubnikova) and wish the speedy recovery of Petty Officer 3rd Class Anna Trubnikova and Officer Jared MacDonald,” she said.

A Go Fund Me social media page was set up for Officer MacDonald. It has raised more than $21,000 at time of publication.