Suddenly (1954)

Suddenly
Crime, Thriller
The tranquility of a small town is marred only by sheriff Tod Shaw's unsuccessful courtship of widow Ellen Benson, a pacifist who can't abide guns and those who use them. But violence descends on Ellen's household willy-nilly when the U.S. President passes through town... and slightly psycho hired assassin John Baron finds the Benson home ideal for an ambush.
Starring
Frank Sinatra, Sterling Hayden, James Gleason, Nancy Gates, Kim Charney, Willis Bouchey, Paul Frees, Christopher Dark, James O'Hara, Kem Dibbs
Directed By
Lewis Allen