A Four State woman investigating the disappearance of her sister looses her home in a devastating fire. Rena Derryberry began receiving threats recently but didn`t take them seriously. On Monday she returned home to find the second floor of her Jay Oklahoma house on fire. Then yesterday her house was torched yet again. The state fire marshals office has been called in to investigate. Derryberry has been pressing the Delaware County Sheriff`s Department to re-open her missing sisters case, but the current sheriff says he can`t find the old files. Barbara Johnson-Willard has been missing since 1996.