It is found on the 2nd floor of Cambridge Polymer Labs, in the research area. The letter is located on a desk next to the alleged skeleton of Tom Franklin. On the desk itself there are a broken computer, a box of arsenic, a teapot and a teacup.
Everyone else left tried to get into Bergman's lab to get the password for the Isotope Containment, but he rigged up some kind of gun. Ericka was killed. Most of my hair is gone from the radiation and I can barely see. There's no way I can finish the research on my own now, so I've chosen to make it a quicker end.
Jon Elwood, I'll see you in hell.
- Tom Franklin