A Swiss court sentenced the former lover of French financier Edouard Stern to 8½ years in prison for murder after she confessed to shooting him during an argument while the two were having sex and he was tied to a chair in a flesh-colored latex bodysuit.

Cécile Brossard testified during the trial that she had flown into a rage when, while the two were together one evening in February 2005, Mr. Stern had suggested she was a prostitute.

"A...