Born on October 20, 1819 in New York City, Sickles married Teresa Bagioli, half his age and in her mid-teens, in 1852. He was elected to Congress four years later. They had a daughter, Laura, and were popular hosts to the Washington elite and insiders. It was at one of these soirees that Teresa, youthful and charming with a lovely round face, met the handsome and connected Philip Barton Key, the local District Attorney. A widower, Key beckoned from a famous family. His father, Francis Scott Key, wrote the "The Star-Spangled Banner" while his uncle, Roger Taney, served as Chief Justice of the United States Supreme Court. Key and Teresa soon started an illicit romance, with Key going so far as renting a home to unsuccessfully shield their trysts from an all-knowing public.
Sickles soon learned of the affair upon receiving an anonymous letter. Like lightning striking a mighty oak, Sickles, despite his past affairs, was jolted by the news. He wept and groaned and confronted his young wife, who he forced to write a confession. In it, she admitted, in part, that she “did what is usual for a wicked woman to do.”
The next day, February 27, 1859, the lovesick Key wandered near the Sickles home with the hope of seeing his lover. Sickles spotted Key, who at forty was slightly older than Sickles, and became enraged. In short order, he followed and confronted his wife's lover, winding up in front of the White House. “Key, you scoundrel, you have dishonored my house. You must die!”
Sickles drew a pistol and fired. A near miss inflicting only a minor injury to Key’s hand. A scuffle. Sickles pulled back and drew another gun. “Don’t murder me!” Key cried. From a few feet away, Sickles shot Key in the upper leg. Key collapsed to the ground, screaming for mercy.
Sickles again pulled the trigger. Click. A misfire. He pulled it yet again. This time a bullet went surging into Key’s body just below his heart. Sickles stepped even closer. Click. Another misfire. A bystander jumped in. Too late.
Like the speed of the bullets leaving his gun, the news of the shooting shot throughout the nation, monopolizing the headlines. Sickles confessed to the killing and sat in jail where countless friends and politicians came to visit. He bemoaned the state of his marriage even though his own adultery was well known.
His murder trial began April 4, 1859. Sickles' legal team was impressive, with future Secretary of State Edwin Stanton and James Topham Brady, an insanity expert, representing him. That temporary insanity had not been used before was no impediment to it being used now.
Robert Ould inherited the job as District Attorney. The trial at City Hall was crowded, the weather hot and muggy. The prosecutor depicted Sickles as a walking arsenal, intent on murder. Brady countered that Sickles was a hero doing away with Key, a sexual predator. He also portrayed his client as being driven to temporary insanity, pushed over the edge by an unfaithful wife. Sickles cried as the witnesses testified.
After a nearly month long trial, the jurors set off to decide Sickles’ fate. They didn't need much time. After 70 minutes, they came back. Not guilty.
Sickles' popularity, political connections and crafty lawyers all combined to save him. He became the first defendant in America to successfully use the defense of temporary insanity. His supporters rejoiced. Sickles soon recounted the details of the shooting and casually admitted that he had every intention of killing Key.
Despite his marital woes, it was not adultery that ended his marriage but death. Teresa died in 1867 from tuberculosis. Sickles became a Union general during the Civil War and lost a leg in defense of his nation. Despite his questionable decisions at Gettysburg, he was awarded the Medal of Honor, although it took some 34 years of probable campaigning to receive it. He remarried in 1871 and had two more children, before parting ways due to his womanizing. At 93, he was accused of embezzling $27,000 from the New York State Monuments Commission, which he chaired. A year later, in 1914, he suffered a cerebral hemorrhage in New York, died and was buried in Arlington National Cemetery.