A kiss before dying

So true....Here is the plot summary from Wikipedia

"Jonathan Corliss, Matt Dillon, is a poor college student with aspirations of wealth. Since childhood he has been obsessed with the fortunes of a company called Carlsson Copper.

While a student at the University of Pennsylvania, he plans to ingratiate himself with the wealthy family of magnate Thor Carlsson (Max von Sydow) and has begun secretly dating Carlsson's daughter Dorothy (Sean Young).

When Dorothy learns that she's pregnant, she informs Jonathan that she'll be cut off without her inheritance when her father learns the truth. Jonathan decides to murder her, and makes it look like a suicide, then he moves to New York.

There, he makes the acquaintance of Ellen Carlsson (also played by Young), the late Dorothy's twin sister, and begins courting her.

This time he is more successful, winning Ellen's hand in marriage and a powerful position in his new father-in-law's company. However, Ellen has long been dubious of the circumstances surrounding her twin's death, and she probes deeper into the supposed suicide.

She uncovers alarming facts about some other murders and the identity of her sister's unknown lover."

Except for the motive, it's pretty much the same.