Silk Stalkings - Season 4 Episode 21 Cadillac Jack

When Rita's friend Gina washes ashore in Margaritaville she decides to join the two local officers assigned to the case--Jack Duvall and Savannah Smith. While Savannah doesn't like the idea of Rita tagging along, Jack is smitten by Rita. After some investigating, they discover that Gina must have been out on a boat the night she was murdered. The two main suspects are Davis Lee--a fishing guide with a sketchy past, and Steve Bolton--a polo player, and husband of the Senator--whose boat they suspect was used. Savannah, who's had a few relationships with Davis in the past, believes his innocence but is afraid Bolton will be able to pin the murder on him. Meanwhile, Jillian wants Chris to move to Boston with her after she is offered Chief of Surgery at Mercy Hospital.