Under what legal theory was Mary Surratt hanged as an assassin of President Lincoln in 1865?

Who was the first woman hanged in the United States?

Mary Surratt

For nearly her whole life, Mary Surratt lived just outside of Washington, DC in Prince George’s County, Maryland. She and her husband ran a successful tavern/hotel in the county and, in the early 1850s, the area surrounding the their business was named Surrattsville (now Clinton, Maryland).

What was John Surratt charged with?

(April 13, 1844 – April 21, 1916) was an American Confederate spy who was accused of plotting with John Wilkes Booth to kidnap U.S. President Abraham Lincoln; he was also suspected of involvement in the Abraham Lincoln assassination.

John Surratt
Service branch Confederate Secret Service
Rank courier, spy