NEW : In an affidavit filed December 2009 , Powell said , `` I am standing tall for my sons '' NEW : Susan Cox-Powell killed himself and his sons in a `` double homicide , '' an official says . `` This was all on him . He set this up , he did it , '' the sheriff 's spokesman adds . Josh Powell has said he last saw his wife , Powell , in last week .
NEW : In an affidavit filed last week , Powell said , `` I am standing tall for my sons '' NEW : Josh Powell killed himself and his sons in a `` double homicide , '' an official says . `` This was all on him . He set this up , he did it , '' the sheriff 's spokesman adds . Powell has said he last saw his wife , Susan Cox-Powell , in December 2009 .