State trooper killed his ex-girlfriend, her new boyfriend and himself

The crisp summer air of the Pittstown section of Franklin Township, New Jersey, carried the scent of freshly cut grass on August 2nd—and the metallic tang of blood.

At 12:22 p.m., Franklin Township police arrived at 33-year-old Dr. Lauren Semanchik’s home on Upper Kingtown Road to find a scene of unspeakable violence: the beloved veterinarian and her new boyfriend, 29-year-old volunteer firefighter Tyler Webb, lay dead from gunshot wounds.

Their killer? A man sworn to protect the public: New Jersey State Police Sergeant Ricardo Santos, who hours later would die by his own hand in a Piscataway park.

Santos’ body, a semiautomatic pistol beside him, was found in a white Mercedes-Benz sport utility vehicle parked in Middlesex County’s Johnson Park, located on the banks of the Raritan River in Piscataway and Highland Park.

Santos, a member of the elite executive protection unit who once guarded Governors Phil Murphy and Chris Christie, had transformed from protector to predator.

After Semanchik ended their brief relationship in September 2024, he waged a campaign of terror: flooding her with calls from blocked numbers, keying her car at the Long Valley Animal Hospital where she healed pets, sabotaging her car with water in the gas tank, and even planting recording devices in her home.

“He relished control,” her mother, Jeannine Semanchik, revealed.

When Lauren—recovering from broken feet—used a wheelchair early in their relationship, Santos orchestrated “wheelchair dates.” Once she healed and asserted independence, his facade crumbled into obsession.

At 7:08 p.m. on August 1st, neighbors reported gunshots and screams piercing the rural calm of Upper Kingtown Road in Hunterdon County’s Franklin Township.

Local police responded but left without locating the source.

They missed the horror unfolding just yards away: Santos, lying in wait after tailing Semanchik home in his white Mercedes SUV, then stalking through woods near her driveway like a soldier on a covert op.

Vehicle surveillance footage—installed by Semanchik in desperation—captured Santos’s merciless precision:

• 5:25 p.m.: Semanchik leaves work; Santos follows.
• 5:57 p.m.: She arrives home; he conceals himself.
• 6:45 p.m.: Webb’s car pulls in—a beacon of new love Santos would extinguish.

By the time Semanchik’s father discovered the bodies the next afternoon, Santos had fled to Johnson Park, where he turned his service weapon on himself.

The Fractured Blue Wall

Semanchik had begged authorities for intervention. She contacted Santos’s colleagues and sought a restraining order, but was met with bureaucratic silence. “A lot of agencies failed her,” her mother stated. “Nobody called her back.” 

The system’s inertia now echoes in anguished Facebook comments: “When will women’s pleas be taken seriously?” 

Governor Murphy’s office expressed being “shocked and devastated,” but did not explain how an armed stalker remained on active duty despite Semanchik’s pleas.

Santos’ access to weapons and tactical training—meant for public safety—became tools of annihilation.

Dr. Semanchik was remembered as “one of the kindest souls” in veterinary medicine, whose hands healed wounded animals. Webb, a Pinewald Pioneer firefighter, was eulogized for his dedication as Chief Engineer and Trustee—a man who ran toward flames while Santos trafficked in darkness.

“She was shot in the back,” her sister Deanna revealed. “She was running away.” 

The Unanswered Questions

Hunterdon County Prosecutor Renée Robeson called the killings “a senseless and devastating loss,” urging domestic violence victims to seek help—a plea that rings hollow to grieving families who witnessed the system’s collapse.

With Santos dead, legal accountability vanishes, but the moral reckoning remains:

Why did Franklin Township police dismiss the Friday night screams?

Why was Santos’s pattern of harassment—known to colleagues—ignored?

And when will law enforcement confront the lethal intersection of badge authority and intimate violence?

As candlelight vigils glow outside Semanchik’s animal hospital and Webb’s fire station, New Jersey faces a truth as stark as the autopsy reports: those sworn to serve sometimes betray, and justice delayed is justice incinerated.