Dragnet

 
Series aired: 1951 - 1959
Video from Internet Archive
 
Primetime TV  
 

The Big September Man

Season 1, Episode 11
May 8, 1952
 
A secretary is found beaten to death and there seems to be no real motive for the crime. Eventually, the trail leads to a fanatically religious former beau whom she rejected.  
Dragnet
Available on DVD