Dynasty - Season 4 Episode 10 : The Proposal 1989

At Alexis' office, Dex discovers a confidential file marked ""Tar Sand"" and beats her to the contract. Later, he offers her a 60-40 split. An enraged Jeff locates Adam at the summit of the Carrington Plaza. After exchanging vicious insults and violent punches, Adam tumbles halfway over the edge. As Jeff is about to finish him off, Adam frantically explains he had no idea he fathered Kirby's child, and Jeff allows him to crawl to safety. Jeff intercepts Kirby as she is about to leave for Paris. Blake proposes marriage to Krystle, who happily accepts.