At the end of Taking Lives we see that it was James Costa aka Martin Asher who is the real killer. But by that time this is discovered he has had sex with
war
the-caller
bonnie-and-clyde
we-bare-bears
first-cow
the-rookie
ninja-scroll
wild-wild-west
beauty-and-the-beast
sharp-objects
christopher-nolan
stargate-1994
frenzy
the-deer-hunter
hunter-hunter
teletubbies
monsters-vs-aliens
the-shawshank-redemption
wet-hot-american-summer
free-state-of-jones
dallas-buyers-club
legion
jessica-jones
a-most-wanted-man
the-boy-in-the-striped-pyjamas
somewhere
hammer-house-of-horror
ghostbusters
the-assignment
empire