On a road near Barrington, Illinois, on November 27, 1934, federal agents Samuel Cowley and Herman Hollis pulled up behind a stolen Ford. Inside sat Lester Gillis—known to the country as Baby Face Nelson—and he knew the agents were closing in. Within minutes, gunfire erupted on the highway. Before the night was over, Cowley and Hollis lay dead, and Nelson himself was mortally wounded, his body dumped in a ditch near a cemetery in Niles Center.

No other fugitive of the Depression era killed so many FBI agents in a single firefight. But that was the end of a long road. The story of how Nelson got there, and why he behaved the way he did, runs through another killing—one that took place six months earlier, in Louisiana, at the ambush of Bonnie Parker and Clyde Barrow. On May 23, 1934, police shot Bonnie Parker and Clyde Barrow to death in their car near Gibsland, Louisiana.

Bonnie was hit twenty-six times. She died in the passenger seat beside Clyde. The ambush was not just a public execution of two outlaws; it was a message broadcast to every fugitive in America, and especially to the women who rode with them. Until that morning, a woman who traveled with a wanted man might have hoped the law would hold its fire on her account.

That hope died on a Louisiana road. Every woman tied to a wanted man now understood: the government would shoot her too. The message landed hardest on one couple in particular—Lester Gillis, known by then as Baby Face Nelson, and his wife Helen. Consider Nelson’s position at that moment.

He was twenty-five, and his face ran in every newspaper in the country. He was hiding in the outskirts of Chicago, the third-largest city in America, with federal agents and local police hunting for him. A month before the Louisiana ambush, outside the Little Bohemia lodge in Wisconsin, he had shot three lawmen at close range, killing federal agent W. Carter Baum.

Killing a federal agent had made surrender all but impossible. The FBI’s own reports would later admit that his whereabouts during late May and early June of 1934 were obscure. They simply lost him. In a city swarming with police, with his picture everywhere, Nelson kept himself invisible for weeks at a time.

That required discipline of a kind few fugitives ever achieved. Helen Gillis, meanwhile, was technically free. She had been arrested at Little Bohemia when the men fled, held, tried, and released on bail. By May, she was legally clear of trouble.

She could have walked away. The smart play was to stay away, keep quiet, and let the government forget her. Instead, she went back to Little Bohemia. Around a month after the shooting there—coinciding almost exactly with the ambush of Bonnie and Clyde—she rejoined her husband.

The two lived quietly near Lake Geneva, Wisconsin, for several days before moving on. A young mother of twenty-one, whose husband was the most wanted man in America, chose that particular week to climb back into the car with him. The newspapers were still running photos of the dead outlaws in Louisiana, two bodies riddled with bullets. The lesson was plain: the law would kill the woman beside the man.

Helen saw that lesson and went anyway. The last outlaw couple in America watched what happened to another outlaw couple, and they remained a couple. Nelson’s professional reply came five weeks later, and it was unmistakable. On June 23, 1934, the Attorney General issued a federal warrant for Nelson’s arrest.

Seven days later, on June 30—thirty-eight days after the Gibsland ambush—Nelson walked into the Merchant’s National Bank in South Bend, Indiana, with John Dillinger and Homer Van Meter. They robbed the bank in broad daylight. A police officer was shot and killed during the robbery. Nelson himself reportedly took a bullet to the chest, but the shot was stopped by a bulletproof vest he was wearing.

The gang fled to Chicago. Later, when two police officers approached their meeting place on Wolf Road outside the city, Nelson shot at them as well. That was his answer to the Louisiana policy. The government had staged the Bonnie and Clyde ambush, offered rewards for information leading to Nelson’s capture, and made clear what waited at the end of the trail.

Nelson responded by robbing a bank alongside two of the most wanted men in America and opening fire on every officer who came close. The ambush did not make him more careful in his work. It made him more careful in everything except the work itself. That contradiction defined him.

In hiding, he was so disciplined that federal files conceded they lost him for a week at a time. In action, he behaved as if May 23 had never happened. Other men on the list of wanted fugitives read about the ambush and quietly stopped robbing banks, without any announcement of retirement. Nelson did not slow down at all.

The rough logic behind his behavior was harsh but sound. A man facing prison might be deterred by the threat of a harsher sentence. Nelson had already faced the worst consequence possible. You cannot threaten a man with what he has already been promised.

His entire summer proved he understood this calculation with perfect precision. The months that followed showed the same pattern stretching across the country. He moved between Chicago and the West Coast, sometimes returning to the same spots, a clever man trying to figure out how far the situation would stretch. He seemed to believe he would either be killed before it was over, or that he might manage something else entirely.

Nelson, Helen, and their partner John Paul Chase left Chicago for California. They spent the rest of the summer moving back and forth between Chicago and the West Coast, staying in auto camps and taking back roads. On one occasion, a small-town policeman stopped them for speeding. Nelson went to the police station, paid a five-dollar fine, and drove off.

No one searched the car, which contained a machine gun, a rifle, and ammunition. The most wanted family in America passed a routine traffic stop like any other family on a road trip, because Nelson stayed calm and collected everywhere except inside a bank. They wandered through Sacramento and San Francisco, then headed to Reno and Las Vegas. In October they stayed in auto camps and hot springs in Nevada.

In early November they turned back toward cold Chicago. On November 27, 1934, on the highway outside Barrington, Illinois—six months and four days after Bonnie and Clyde—federal agents Samuel Cowley and Herman Hollis spotted Nelson’s stolen car, which he was driving. The encounter turned into a gun battle. Both agents were killed.

Nelson was hit multiple times and died that night. He was twenty-five years old. His body was found the next morning in a ditch near a cemetery in Niles Center, after an anonymous phone call told the government where to look. That was Baby Face Nelson’s reaction to the deaths of Bonnie Parker and Clyde Barrow.

He watched what happened to them, understood exactly what it meant for himself and for his wife, and chose to keep going. The last outlaw couple in America stayed together to the end, and Nelson met the same fate he had been promised. He simply took as many lawmen with him as he could on the way down.