Those who are getting long of tooth will remember that this charge was among the many promulgated by the right during their Clinton era feeding frenzy. The allegations were thoroughly investigated by Special Prosecutor Ken Starr and found to be baseless; Vince Foster committed suicide. In spite of this finding, conservative media outlets such as Fox News, the Washington Times and American Spectator continued to promote the Foster assassination conspiracy theory. Sean Hannity continues to promote it on his Fox News program. (Read here.)
This is not the first time Weiss has written about this subject, his having written an article concerning these conspiracy theories which was published in the New York Times Magazine back in 1997 (read here). Both that article and this new one deal with accusations by one Gary Parks, whose father, Jerry Parks, did security for the Clinton campaign's Little Rock headquarters during the 1992 presidential campaign.
Back in 1997, Weiss wrote of the senior Parks:
"He was a big man who is sometimes described as a bully, and in 1991 he contracted to provide private security for the Clinton campaign headquarters in Little Rock."
In 1993, Jerry Parks was gunned down gangland style as he drove in Little Rock. According to Weiss' Times article, Gary Parks was so upset by his fathers murder that he
"walked off his job as the ''go-to guy'' at a car dealership. Later, he told me, he ran a female escort service."
I'm not sure what a "go-to guy" is as a job title, but is Weiss saying that Gary Parks went from working as a used-car salesman to working as a pimp? (The euphemisms are flying fast and furious in Weiss' article, so my apologies to Mr. Parks if I'm reading the sentence incorrectly.) To shore up Parks' bona fides, however, Weiss informs us that Parks turned down big money from the National Enquirer for his story.
What is this story? In a nutshell, Gary Parks told Weiss, and Weiss believed, that Vince Foster was hired by Hilary Clinton to prepare for the Clintons' divorce. That divorce was planned by Hilary Clinton, Weiss writes, in her fury over Bill Clinton's decision not to seek the presidency in 1988. Weiss credulously reports Gary Parks' allegation that Foster's prep for the Clinton divorce included preparation of a Bill Clinton peccadilloes list, a job Parks claims his father was hired to do.
However, Weiss' article in the Times reveals several facts that indicate that this theory is far from bullet-proof. It says that Jerry Parks was no angel and that others had both motive and opportunity to kill him. It quotes the Little Rock homicide detective who investigated the case to the effect that Gary Parks had not one shred of evidence for his accusations. It also says of Gary Parks that he
"cooperated with the makers of a Clinton-bashing mail-order video. ''I feel that Bill Clinton had my father killed,'' Parks says on the tape, offering no evidence. Parks now feels he got carried away: ''I'm the first to admit some of the things I said on the video were wrong. I'd just come out of my trance. I don't think my head was completely back on straight.'' "
"There have been suggestions that (Jerry) Parks was shaking people down with what he knew; and he came to a bad end. We are talking about a situation in which two Clinton aides [i.e. Parks and Foster] die of mysterious violent causes inside of 2 months. And the pattern is consistent with what Kathleen Willey experienced, Gennifer Flowers experienced, and Linda Tripp too: If you knew something about Bill Clinton’s sex life, that was dangerous information. No wonder there are guns in Primary Colors."

Philip Weiss
Afterthought: Weiss has a longer, more involved history with the Vince Foster story than I was previously aware of. He not only wrote about it at the time , in the years since has blogged about it repeatedly. He's expressed some strong, sometimes contradictory emotions about the matter, showing that his motive may be based less on the facts of the case than on anti-Clinton bias. Strangely, he's also attacked Foster, the purported victim of the conspiracy, as "a rube ... with a huge superego". Weiss may not know much about Freudian psychoanalysis, but he knows what he doesn't like.
Check out what he wrote here about his confused personal feelings about this matter and tell me what on earth this guy can be thinking. He writes there of his motivation for believing in this conspiracy.
"I liked Gary Parks. I felt he was honest and smart. His assessment of Bill Clinton’s personality was the best I heard. He said if Bill Clinton had gone to bed with your sister and then screwed her over, and you were enraged with him, he could walk in the room and ten minutes later you’d have forgotten about it completely, he was that seductive."
By the way, maybe the question posed by this Daily Kos post provides a good subject for a Weiss follow-up: "Did Obama's Birth Certificate Kill Vince Foster?"