brian karl brimager , 37 , was indicted by a grand jury in san diego .
is accused of murdering clothing designer yvonne lee baldelli in 2011 .
allegedly dismembered her body and disposed of it in a military backpack .
then engaged in an elaborate scheme to cover up the crime .
sent emails from her account to make people think she was still alive .
he has been in custody since june 2013 on charges including obstruction of justice and falsifying records related to the investigation .