On the night Pat Garrett pulled the trigger in a dark bedroom in Fort Sumner, New Mexico, he killed more than a man. He killed a paper trail. Within hours, the body was in the ground. Within days, the story was already changing, and within years, the truth about who Billy the Kid really was had become so tangled in legend that even the basic facts of his origin were up for debate.
Historians could not agree on his birthday, his real name, or whether his father was Patrick McCarty or Michael McCarty or some unnamed man who vanished before Billy ever learned to walk. What they could agree on was this: his mother was deeply, unmistakably Irish. A woman who danced jigs at town socials, sang old songs while she washed other people’s laundry, and raised two boys alone in a country that did not particularly want her kind. Neighbors remembered her, again and again in the historical record, as a jolly Irish lady full of life and mischief.
That phrase appears over and over from different people in different states across different decades. She passed something of herself into that boy—her humor, her stubbornness, her ability to charm a room while simultaneously planning an exit. Before anyone can understand Billy the Kid, they have to understand where his mother, Catherine McCarty, came from. And that story begins not in New York, not in New Mexico, but on a small island being swallowed alive by famine, disease, and despair.
The year was 1845, and Ireland was dying. A fungus called Phytophthora infestans swept through the potato fields, turning crops black overnight. For a country where the rural poor survived almost entirely on potatoes, it was a death sentence written in rot. Within the first year, the hunger began.
Within two years, it had become one of the greatest humanitarian catastrophes of the nineteenth century. Between 1845 and 1855, roughly one quarter of an entire nation’s population was permanently removed from its homeland. Two million people gone—some into the ground, most onto ships. The province of Ulster in the north of Ireland was not spared.
County Antrim, a coastal county at the northeastern tip of the island, watched its people pour out through the ports of Belfast, Larne, and Liverpool, desperate to reach anywhere that was not here. According to researchers who traced the McCarty family line, Catherine was born around 1829, a girl from Antrim. That detail matters more than it might seem, because County Antrim carries a specific genetic signature shaped by centuries of Scottish settlement, Viking coastal raids, and a distinct Ulster Irish heritage that makes it traceable through modern DNA databases in ways other Irish counties are not. In the spring of 1846, Catherine boarded the Devonshire in Liverpool.
She was seventeen years old, traveling alone, listed on the ship’s passenger manifest simply as a servant. She was one of 277 passengers and the only person on that ship with the surname McCarty. She arrived in New York Harbor on April 10, 1846, stepped onto American soil, and began building the life that would eventually produce the most mythologized outlaw the West has ever known. New York in 1846 was not a welcoming place for an Irish girl traveling alone.
The city was flooded with immigrants, most of them desperate, many of them sick, all competing for scarce jobs and overcrowded tenement rooms. Signs in boarding house windows read No Irish need apply. Churches were burned by mobs who saw Catholic immigrants as a threat to the Protestant fabric of American life. Catherine McCarty walked into all of that at seventeen years old.
Indentured domestic service was one of the only paths available to a young Irish woman with no money, no connections, and no family waiting on the docks. She would have worked for a wealthy household, cooking, cleaning, laundering, running errands in exchange for a roof and meals. She survived. By the late 1860s, she had made her way west to Indianapolis, Indiana, where census records show her living as the head of her own household with two young sons, Henry and Joseph.
No husband listed. No father named for the boys. By 1870, she had moved again, this time to Wichita, Kansas, with her two boys and a man named William Antrim, thirteen years her junior, who had attached himself to her household somewhere along the way. In Wichita, Catherine did something remarkable.
She bought property. She opened a laundry business on North Main Street. In a frontier town that was still more mud and ambition than actual city, a single Irish immigrant woman with two sons not only survived but put her name on a deed. She was also, according to historical records, the only woman to sign the petition that helped incorporate Wichita as an official municipality.
In 1873, Catherine and William Antrim married at the First Presbyterian Church in Santa Fe, New Mexico. By then, her health was already failing. Tuberculosis. Doctors recommended the dry southwestern climate as the best chance of slowing the disease.
The family settled in Silver City, New Mexico, where Catherine continued washing clothes and taking in boarders even as she grew weaker. Neighbors remembered her kitchen as warm, her table as generous, and her laugh as the kind that carried through walls. Her son Henry, twelve years old, was her shadow. He danced with her at local socials.
He sang with her at home. He was by all accounts his mother’s child. Catherine McCarty Antrim died on September 16, 1874, in Silver City, New Mexico. She was forty-five years old.
On her deathbed, she told a friend she was worried about leaving her boys in such a wild country. Within months of her death, her fourteen-year-old son Henry was arrested for the first time, caught holding stolen goods belonging to a local laundry. It was a petty crime. He was a scared boy without a mother and without a plan.
But it was the beginning of the trajectory that would end in Fort Sumner seven years later with Pat Garrett’s bullet. What almost no Billy the Kid biography spends enough time on is what died with Catherine that September afternoon. Not just a mother, but a living connection to Ireland, to County Antrim, to a language, a culture, a way of moving through the world that she had carried across the Atlantic on a famine ship and kept alive in tenements and laundry rooms and frontier kitchens for nearly thirty years. Because historians have quietly documented something that popular legend almost completely ignores: Billy the Kid spoke Irish Gaelic.
Not just Spanish, which he was famously fluent in, and not just English. He spoke the language his mother had brought from Antrim. Evidence comes from a 1954 recording in which a cowboy named Clark Hust recalled working at Pat Coglan’s Three Rivers Ranch in New Mexico. Coglan, born in Clonakilty, County Cork, in 1822, had a niece named Mary who came to visit from Ireland.
Mary spoke only Irish and could not communicate with anyone at the ranch except the Coglands and one other person—Billy the Kid. Gaelic in the 1870s American West was not a language you picked up casually. There were no textbooks, no classes, no evening courses in frontier New Mexico. The only way a boy born in New York City in 1859 could speak fluent Irish Gaelic by his late teens was if someone had taught him at home.
The only person in a position to do that was Catherine, which means she herself was a native Irish speaker, which means she almost certainly came from a part of Ireland where Irish was still the dominant daily language in the 1830s and 1840s. By the mid-nineteenth century, the areas where Gaelic remained a first language were concentrated in the west and northwest, in counties like Galway, Mayo, Donegal, and in specific pockets of Ulster. County Antrim had Gaelic-speaking communities along its northern and western edges, particularly in the Glens of Antrim, a rugged coastal stretch where the old language survived longer than almost anywhere else in the north. When researchers began mapping Catherine’s linguistic profile against the county claim, the Glens of Antrim kept appearing as the most probable point of origin.
Nine valleys cutting down from the Antrim Plateau to the northeastern coastline, a landscape of dark green hills dropping sharply to a gray sea. This was subsistence Ireland, where families farmed tiny plots on steep hillsides and spoke Irish among themselves. The famine hit the Glens hard. Evictions followed crop failure as landlords cleared estates of tenants who could no longer pay rent.
The nearest port of any size was Larne, from which ships crossed to Scotland and then connected to Liverpool, the main departure point for transatlantic crossings. That is almost certainly the route Catherine took: from the Glens to Larne to Liverpool to the Devonshire, a journey of roughly three thousand miles that began in a Gaelic-speaking valley and ended in the most chaotic immigrant city on Earth. In 2003, New Mexico Governor Bill Richardson announced a plan to exhume Billy the Kid’s grave in Fort Sumner and compare DNA to that of his mother, Catherine, in Silver City. The goal was straightforward: establish a maternal DNA baseline from Catherine’s remains and compare it to whatever could be recovered from Fort Sumner, to settle whether the body in that grave was actually Billy.
But the remains could not be found. The team arrived at Silver City Cemetery with court orders, forensic specialists, and the full backing of the governor. They started digging. They found nothing.
No coffin, no remains, not a fragment. They expanded the search area, consulted old cemetery maps, interviewed local historians. Still nothing. Katherine McCarty’s grave had effectively vanished.
Without Catherine’s mitochondrial DNA, there was no maternal baseline. Without a maternal baseline, there was nothing to compare against the bone fragments later recovered from Fort Sumner. The entire genetic investigation collapsed before it had properly begun. What researchers were left with was the documentary record: ship manifests, census entries, parish records, land valuations.
And what that paper trail suggests, when followed carefully, is a portrait of a woman whose origins point with remarkable consistency toward the northeastern corner of Ireland. Catherine arrived from Ulster. She spoke Irish as a first language, passing it to her son fluently enough that he could translate for a native speaker decades later. The surname McCarty appears in Northern Irish records, including Antrim, in the early nineteenth century.
The ship she sailed on departed from Liverpool, the primary transit point for immigrants leaving through Ulster’s ports. Her departure in April 1846 places her among the earliest and most desperate wave of famine immigrants. None of this is a DNA result. None of this is the kind of hard scientific proof a laboratory can certify.
But it is convergent evidence, multiple independent lines of inquiry pointing toward the same location: a girl from the Glens of Antrim, or somewhere very close to them, who packed her language and her stubbornness and her gift for survival into a servant’s bundle and walked onto a ship that would carry her bloodline to the other side of the world. Billy the Kid was many things: an outlaw, a gunfighter, a mystery. But underneath all of it, he was the son of a famine survivor, a first-generation American carrying County Antrim in his bones and Irish on his tongue in the middle of the New Mexico desert. The DNA may never be recovered.
The grave may never be confirmed. But the trail from the Glens of Antrim to Fort Sumner is real.