I googled the report that was listed at the end of the article:

Source: Moore TJ et al., Serious Adverse Drug Events Reported to the Food and Drug Administration, 1998-2005, Archives of Internal Medicine, Sept. 10., 2007; 167 (16): 1752-1759

http://health.msn.com/health-topics/...0198254&page=2

hoping to learn the cause(s) of death, for the people taking Betaseron.

I found this PDF:

[PDF] Confidential. Do not distribute. Pre-embargo material.

File Format: PDF/Adobe Acrobat

Serious Adverse Drug Events Reported to the Food and Drug Administration, 1998-2005. Thomas J. Moore, AB; Michael R. Cohen, RPh, MS, ScD; Curt D. Furberg

www.ismp.org/pressroom/PR20070910_1.pdf

alas, the PDF doesn't say WHY people died, just explains how they gathered the information.