This is an early book of author Barbara Burnett Smith, who wrote the "Purple Sage Mysteries" this is a Cassie Ferris Mystery--Cassie finds herself at the top of the suspect list, after her radio partner is murdered.
An Austin, Texas based mystery by Barbara Burnett Smith, author of the Purple Sage series, featuring Cassie Ferris, a radio talk show host. She co-anchors with the arrogant Roger Weber who turns up dead, leaving Cassie as the leading suspect.
"amateur sleuth" sub-genre - the sleuth is a morning drive-time DJ named Cassie whose obnoxious partner gets killed.