Uncontrollable frenzy and a unique temporary insanity plea

Area of Science:

• Legal History
• Forensic Psychology
• American History

Background:

• This case examines the legal and social context of a high-profile murder trial in 19th-century Washington D.C.
• It involves a U.S. Congressman, Daniel E. Sickles, who murdered Philip Barton Key, the U.S. Attorney for D.C. and son of Francis Scott Key.
• The incident occurred in Lafayette Park, across from the White House, highlighting the political and social prominence of those involved.

Observation:

• Sickles, a married Congressman, discovered his wife's affair with Philip Barton Key.
• Sickles confronted and fatally shot Key in broad daylight.
• The event took place on April 1859, creating a significant public and legal stir.

Findings:

• Sickles' defense team argued for temporary insanity, citing an "uncontrollable frenzy" or "brainstorm."
• The defense also invoked the "unwritten law," suggesting a husband's right to avenge perceived dishonor.
• Crucially, the defense relied solely on lay witness testimony regarding Sickles' emotional state, lacking expert medical or psychological evaluation.

Implications:

• The case highlights the historical use of controversial legal defenses, such as temporary insanity and the "unwritten law."
• It underscores the absence of expert testimony in legal proceedings during this era, relying instead on lay opinions.
• The trial's outcome and the defenses employed offer insights into societal norms, honor codes, and the evolving understanding of criminal responsibility in American history.