According to MGM records, the film earned $360,000 in the US and Canada and $450,000 in other countries, resulting in a loss of $496,000. Writing in
The New York Times, reviewer
Howard Thompson praised the film, saying "If 'Key Witness' could be better, we don't know how." He also noted, "...this little picture is fast, tough, tight, sickeningly real to watch and wonderfully well put together." ==References==