I'm 50/50 on whether her husband was responsible. It could have been an accident and he panicked. But then I think it could have been some random person.

I just don't know

We don't even know what the motive would have been, but I feel that Pam is dead. Her husband unwilling to clear his own name only makes him look guilty to me.

Rob’s story is shaky to begin with, but the fact he forged Pam’s name convinces me that he killed her. His overall explanation of what happened is just a joke.