What is the name of this lifetime movie?

I need help I can't remember what the name of it is.It's about this girl like named Donna, her daughter was at her university teacher's house and knocked him papers over and he strangled her and buried her in the yard and then drove her car to her apartment. So the cops thouht her boyfriend did it so the teacher went to the bar and killed her boyfriend and made it look like an accident. Then the girl's mom is at the teacher's house and finds out he killed her so she took a knife and killed him. This was a really good movie does anyone know what the name is, I saw it on the lifetime channel I just can't remember the name. Any help will be appreciated!!!