Looking for the name of this movie..I thought Judd Nelson was in it.?

Set in like New Hampshire rich area like he is not rich but is sleeping with a lady and I think he is in boating and the girl is very rich and they get together and they get married and as the movie go along to find he has a plot with another guy to kill her but he cant bc he loves her and she put him on her will but as the movie ends to find he gets killed...Thats bit and pieces i reme its not a new movie when I saw it it was on VHS.