Tessa and Sandy

We first meet Sandy Woodrow, a colleague of Justin's in the High Commission, when he is explaining to Justin that Tessa's body had been found, murdered.  Here, the phrase "kill the messenger" is somewhat appropriate.  Justin is far too naive to ever have suspected Sandy, the messenger, of any kind of wrongdoing, but certainly would have had reason to.

Sandy is not necessarily responsible for Tessa's death, but he did not play a preventative role in the process either.  Sandy was the person that Tessa believed could pass on her report about Dypraxa.  She first made him promise to send the report to his super, Pellegrin, while she was in the hospital.  Obviously, Tessa's pitiful position after losing her child in childbirth played to her advantage.  Sandy hesitantly agreed then to give her report to Pellegrin.  Later, Tessa asked if he had gotten a response, and this is what Sandy told her that he had received a private personal letter and could not show her.  This was their conversation:

Tessa Quayle: You know me well enough to know that I'm not gonna take 'no' for an answer.  Come on.
Sandy Woodrow: Tessa, I'm supposed to keep an eye on you.  Report where you are and what you're doing.  Trust me, Tessa.  This is something that you should not pursue.  I say that as a friend who cares deeply for you.

When he said he cared deeply for her, Sandy got close to Tessa's face and gently caressed her cheek.  Then, he jumped away when his wife opened the door.  Tessa used this sign of Sandy's true feelings to her advantage.  She tells him that he can "have her" if he shows her the letter from Pellegrin.  His heart beat out his brain, and he agreed to show her the letter.  With a kiss, he makes her promise not to tell anyone.

This letter is key to Tessa's research on the DHS scandal.  At the end of the movie, we find out that in the letter, Pellegrin admitted to being complicit about the pharmaceutical vice.  He wrote that he was going to shred Tessa's report and pretend not to have received it, because if the Commission appeared to have never known about the deaths by Dypraxa, they could not be held responsible for them.  The letter was read aloud at Justin's memorial service so that the public could know who was responsible for the deaths.