STLPR Guild intends to represent nonsupervisory employees among the station's newsroom, events, marketing, development and support staff, totaling about 42 people.
St. Louis police said the man suspected of shooting and killing Ronald Cline Jr. and Leslie Barstow was arrested after crashing his car on Interstate 55.
The woman threatened to shoot up a Social Security Administration office and then opened fire on responding officers, police said. The incident was caught on camera.