<P> Bree develops a rivalry with new neighbor, Katherine Mayfair . Bree and Katherine are very similar, leading to a series of feuds before eventually becoming friends and go into business together, catering dinner parties . </P> <P> After a tornado damages Bree's house, she, Orson and Benjamin stay with Susan, and Orson admits being responsible for putting Mike in a coma . Horrified, Bree kicks him out . During their separation, Edie Britt comes onto Orson, leading to a feud between her and Bree . Edie discovers Benjamin is Bree's grandson and attempts to blackmail her . Bree, however, tells the other housewives the truth, so they all snub Edie . </P> <P> In the season finale, Katherine saves Bree's life by telling her ex-husband, Wayne, her secrets . When Katherine kills Wayne, Bree and the other housewives tell the police that Katherine was terrified of a stalker so she doesn't go to prison . </P> <P> When the events of the series shift ahead by five years in the fourth - season finale, it is revealed that Bree is now a famous cookbook author and her son, Andrew, works with her as her assistant . Bree and Orson have evidently worked out their problems and are still together . </P>

Who sent bree van de kamp the letter