I'm thinking that if the man knew her mother well enough to show up at her funeral, than the woman was hoping he'd come to her sister's funeral as well. Seems a bit extreme to meet a man ....
Maybe he killed the mother and framed the woman for her sister's murder?
Sorry for the delay I see that the suspense was KILLING some of you better you get KILLED by suspense then by some of your follow DISers who answered the question correctly (correctly if you are a serial killer that is )
See the answer in lokis post (a few above this one)
Thanks for posting the link I originally heard it on the Howard Stern radio show a few weeks ago like I said I got it wrong which is right in this case