The File on Thelma Jordon (1950)

Thelma Jordon is in love with a jewel thief, Tony Laredo, and he persuades her to go live with her rich aunt, and steal her jewels. During the robbery, she shoots her formerly-rich aunt, but makes it look like an outside job. Cleve Marshall, an assistant district attorney, is assigned the case, promptly falls in love with Thelma (and she with him), and he maneuvers and presents the state's case against her in such a manner that she wins an acquittal. And, then, Tony shows up. And nothing, from this point, works out favorable for THelma, Clive or Tony.