Who played Angel's sister?

[Joan the Vampire Slayer]

I can't find a listing of who played Kathy, Angel's sister, in The Prodigal. She's not listed in any credits I can find, but she sure looks a lot like David Boreanaz. Does anyone know if she is actually his sister?

I guess no one knows...

 

[charmingslayer]

It sucks that Angelus killed her she seemed sweet.