If it was just that he covered Enron, I wouldn't be suspicious about his suicide.
But he also was involved in poltical activities with Gore, as the link above shows. An excerpt from that page:
Shelterforce's authors have included: on-the-ground activists: Madeline Talbott and Steve Kest of ACORN, Ernesto Cortés of the IAF, Chester Hartman of PRRAC, JoAnn Kane of the McAuley Foundation, Allen Fishbein of CCC, Bob Zdenek of the New Community Corporation
researchers: Gregory Squires, Kale Williams, Rachel Bratt, Anthony Downs, and Jody Kretzmann
journalists: Barry Bearak of the LA Times, Jim Sleeper of the New York Daily News, Bob Herbert and Allen Myerson of the New York Times, and David Moberg of In These Times
and policymakers and influencers: Vice President Al Gore, Mayor Dennis Archer of Detroit, Representative Henry Gonzalez of Texas, and Helen Dunlap of HUD.