NORTHAMPTON, Mass. — For the second time in just over a month, a quiet western Massachusetts city is reeling from a homicide so brutal, so bizarre, and so inexplicable that investigators are now openly asking whether a serial killer is at work.

Vanessa Hatvan, 37, a librarian at Northampton High School, was discovered early Thursday morning hanging from a football goalpost on school grounds—her head missing, her chest cavity opened, and her lungs pulled from her body in a manner one investigator described as "deliberate and theatrical."

THE SCENE: HANGED, BEHEADED, DISPLAYED

Hatvan's body was found at 6:12 a.m. Thursday by a maintenance worker arriving for his morning shift. She was suspended upside-down from the home team football goalpost on the athletic field, a location visible from the school's main entrance, normally within sight of hundreds of students and staff.

She was nude. No clothing was recovered. Her head was gone, cleanly removed. Her chest had been opened from the back, ribs broken and pulled outward. Both lungs had been removed and draped over her exposed ribs like fabric over a frame.

"It was a display," one law enforcement source told Boston 25 News. "Whoever did this has been practicing. Maretti looked like someone was learning. Hatvan was completed. Deliberate. Confident."

UNSETTLING SIMILARITIES — AND A GROWING MYSTERY

• Chest opened: Both Maretti & Hatvan: posterior incisions, ribs reflected
• Lungs removed: Maretti (partial/unfinished); Hatvan (complete, draped over ribs)
• Missing parts: Maretti (hands, left foot); Hatvan (head, possibly more)
• Blood loss: ~60% unaccounted for in both — scene nearly bloodless
• Botanical evidence: Non-native Scots pine & downy birch embedded in wounds — same rare species as Maretti case

The botanical detail, in particular, has only deepened the mystery. Investigators once again recovered pine needles and birch bark on and around Hatvan's body, including, some sources say, embedded in the wounds. The species, Pinus sylvestris and Betula pubescens, the Scots pine and the Downy birch respectively, are not native to Massachusetts. Whether this is a meaningful link, a bizarre coincidence, or something else entirely remains an open question.

"It's unusual, certainly," said a source familiar with the evidence, speaking on condition of anonymity. "But what it means, if anything, we just don't know yet. Sometimes the strangest details are the ones that lead nowhere. Other times, they're the key to everything."

WHO WAS VANESSA HATVAN?

Unlike Maretti, a gentle and beloved dentist, Hatvan was known as a strict, intense presence. A librarian for twelve years, she was feared by some students for her rigid enforcement of rules. "She once gave me detention for having my phone out in study hall," a former student said. But colleagues described her as dedicated and caring. She lived alone on Maple Street, quiet and private, with her cat, which has not been located since the murder.

Neighbors say she rarely had visitors. "No parties. Just her and her cat," one recalled. Police have not commented on whether her home showed signs of disturbance.

'THIS IS ESCALATING'

Dr. Maria Ramirez, a forensic psychologist not involved in the investigation, said the Hatvan killing shows clear escalation. "The first victim was likely left in a conservation area, low risk. The second was left on school grounds, with high visibility & high probability of discovery. That's a killer who wants attention. Removing the head is intimate. Symbolic. It erases identity."

Retired detective James Holloran agreed: "Maretti looked like somebody learning a dark craft. Hatvan? That was a statement. This killer is becoming bolder, faster."

Police have not officially linked the cases, but a State Police spokesperson said Friday: "All options remain on the table, including the possibility that these incidents are related."

COMMUNITY IN CRISIS

Fear has turned to terror in Northampton. Evening foot traffic has plummeted. Police patrols have doubled. A community meeting is set for Monday at City Hall. "I've never been afraid to walk my dog at night," said lifelong resident Margaret Delaney, 71. "Now I don't let my dog out after 8:00 without my son on the phone."

WHAT INVESTIGATORS ARE — AND AREN'T — SAYING

The Northwestern District Attorney's Office won't confirm FBI involvement, though multiple sources say behavioral analysts have been consulted. No suspect description, no vehicle description, no motive released. Police have not said whether Hatvan was killed elsewhere and moved to the school, nor if her head has been found.

"We understand the public's desire for information," a DA spokesperson said. "We also have a responsibility to protect the integrity of this investigation."

TWO BODIES. ZERO ARRESTS. A KILLER STILL FREE.

As of this publication, no arrests have been made in either the Maretti or Hatvan killings. Police ask anyone with information about Hatvan's movements on April 22 or early April 23 to call the tip line. The Maretti family has not commented on the possible connection. The Hatvan family released a brief statement: "Vanessa was our fierce, complicated, wonderful girl. We want justice."

Delia Rawlings, who spoke after the first killing, summed up the mood: "We're all just waiting. Waiting for the next body. Waiting for someone to get caught. I don't know how many more of these this city can take."

This is a developing story. Check back with Boston 25 News for live updates as investigators work to connect these two horrifying crimes.