In the summer of 1897, on the luxury yacht Monhegan off the coast of Maine, a young opera singer named Blanche Chesebrough met Roland Burnham Molineux, heir to one of Brooklyn’s most distinguished families. Roland, a chemist in his father’s successful paint company, had access to rare and deadly compounds through his work. Blanche, beautiful and ambitious, had arrived in Manhattan with dreams of an opera career after singing with the Musical Art Society at Carnegie Hall. Roland introduced her to his close friend Henry Barnet, a wealthy Wall Street stockbroker.
The attraction between Blanche and Henry was immediate and overwhelming, transforming Roland’s trusted friend into his most dangerous rival. Blanche later described Henry’s effect on her as irresistible. In October 1898, Roland confidently proposed marriage to Blanche, certain that his wealth and social standing guaranteed acceptance. She refused him bluntly, declaring that her heart belonged entirely to Henry Barnet.
For a man who had never been denied anything, this rejection struck at the very core of his identity. In his mind, the insult festered and curdled into something far more sinister as he contemplated the impossible truth. His closest friend had succeeded where he had failed. On October 28, 1898, Henry Barnet received what appeared to be a routine promotional sample at his club, a small box of effervescent powder marketed as a harmless digestive aid.
He consumed a dose expecting nothing more than relief from his stomach troubles. Instead, he suffered a violent illness that grew steadily worse until his death on November 10, just thirteen days after taking the powder. During his final painful weeks, Henry mentioned the mysterious powder to his physician, Dr. Henry D.
Douglass, providing a crucial detail that would later unravel the murder plot. Dr. Douglass initially attributed the death to heart failure brought on by diphtheria poisoning, an error that allowed the crime to go undetected for months. The symptoms of mercury poisoning closely resembled diphtheria, creating a plausible medical cover for what was actually deliberate murder.
However, Dr. Douglass had kept the powder container, and later chemical analysis revealed the presence of mercury cyanide, a rare poison accessible only to someone with specialized knowledge of industrial chemicals. When authorities exhumed Henry’s body on February 28, 1899, tissue analysis confirmed the deadly compound, providing conclusive evidence of murder. Remarkably, just eight days after Henry’s death, Roland proposed to Blanche again.
Whether motivated by grief, shock, or the practical realization that her artistic ambitions required financial support, she accepted his second proposal. Their wedding took place on November 29, 1898, a mere nineteen days after Henry’s funeral, timing that would later seem damning to investigators and prosecutors. Blanche had risen from aspiring opera singer to Mrs. Roland Molineux, but she had also become, unknowingly, part of what prosecutors would describe as a premeditated murder.
While his marriage to Blanche satisfied the emotional satisfaction he had sought through killing, Roland’s feuds continued alongside it. He harbored an intense hatred for Harry Seymour Cornish, the athletic director of the Knickerbocker Athletic Club. The animosity between the two men was so severe that Roland had resigned his membership in 1897 when the board refused to expel Cornish, whom he publicly denounced as unsuitable for the position. On December 23, 1898, Harry Cornish received what appeared to be an elegant gift at the Knickerbocker Athletic Club.
The box from Tiffany & Company contained a silver toothpick holder and a bottle labeled Emerson’s Bromo-Seltzer, which seemed to be a genuine headache remedy. Unbeknownst to Cornish, chemical analysis would later reveal that the bottle contained authentic Bromo-Seltzer powder carefully mixed with deadly amounts of mercury cyanide. Cornish took the gift to his shared residence with Catherine Adams, a sixty-two-year-old distant relative, and her daughter Florence. On December 28, Catherine Adams developed a severe headache, and when Florence suggested using the Bromo-Seltzer, Cornish prepared what seemed like an ordinary household remedy.
Catherine drank the mixture completely, trusting what seemed like a simple headache remedy. Almost immediately, she began suffering violent reactions, crying out and attracting everyone in the house as the poison took effect. Medical help arrived quickly, but Catherine Adams died shortly after the doctor arrived, becoming an unintended victim of Roland’s campaign against Harry Cornish. Cornish himself tasted the mixture and fell ill, but Dr.
Hitchcock recognized the symptoms and saved his life. The investigation, led by Captain McClusky, focused immediately on Cornish as the intended victim. Investigators identified Roland Molineux as the primary suspect based on compelling circumstantial evidence, including his public feud with Cornish, his specialist knowledge of chemicals, work in a facility using mercury cyanide, and his account at Tiffany’s. The prosecution built its case around handwriting analysis, with more than a dozen experts testifying that matching handwriting appeared on the address labels of both the K&N powder sent to Barnet and the Bromo-Seltzer packages sent to Cornish.
Roland was arrested on February 27, 1899, and the trial, beginning in November 1899 and ending in February 1900, became the longest and most expensive criminal proceeding in New York history. The jury convicted Roland of first-degree murder on February 10, 1900, and he was sentenced to death. Roland became one of Sing Sing’s most famous death row inmates. He wrote a memoir called The Room with the Little Door about his time on death row.
On October 15, 1901, the New York Court of Appeals issued a landmark ruling that would reshape American criminal law for generations. Without the Barnet poisoning evidence, the prosecution presented a much weaker case. Roland’s second trial began on October 13, 1902, and after only thirteen minutes of deliberation, the jury acquitted him on November 11, 1902. The quick acquittal proved how radically the appeals court decision had shifted the case, turning what seemed like a sure conviction into a swift release.
One week after Roland’s acquittal, Blanche filed for divorce in Sioux Falls, South Dakota, on November 18, 1902, citing mental cruelty. Within two months of gaining her freedom, she married Wallace D. Scott, the lawyer who had represented her in the divorce case. By 1905, Blanche attempted to return to entertainment, planning a vaudeville career, but Roland threatened her attempts at using his name.
She retreated from public life, living quietly until her death in 1954. Roland attempted to rebuild his life, remarrying, but suffered mental collapse in 1914 and was diagnosed with general paresis. He died in institutional care on November 2, 1917.
The case established legal precedents that remain cited in modern criminal trials today.