I'd admired Weiss' work for years and was thrilled to speak on a panel with him in Madison, Wis.

FORBES: Social Media

His sister, who Barthel identified as 16-year-old Madison Wallace, at one point went in after him and ended up falling into the surging water.

CNN: March 16, 2013 -- Updated 0041 GMT (0841 HKT)

Hundreds of friends, colleagues and admirers of slain FORBES journalist Paul Klebnikov memorialized him Oct. 14 at New York's Madison Avenue Presbyterian Church.

FORBES: Remembering Paul Klebnikov