Lured Innocence (1999)

Elsie Townsend is a country towns-girl who wants to leave far away and get rich. She becomes the spoiled mistress of married local businessman Rick Chambers, but when his sickly wife Martha tells her to fear he wants to kill her to be free and yet keep her money, accepts to kill him together- which is a setup to scare Martha to dead. However Rick alone is locked away, and Elsie arranges an original alibi by slipping away from the bed of decent epilepsy-sufferer Elden Tolbert, whom she made betray his true girlfriend and arranged to pass out from alcohol so she could slip out for the murder during his seizure so he cannot deliver a fatal testimony, even if he wouldn't be willing to lie for her before moving with his family when going to Arizona University...