Former state finance director Henry Mabry spent more than two hours behind closed doors at the federal courthouse in Montgomery. When Mabry left, he declined comment, as did his lawyer Ron Wise. Federal prosecutors also were tightlipped.
The grand jury has met for eight days over a three-week period, hearing from people involved in Siegelman's unsuccessful campaign for a state lottery in 1999 and those involved with a state tax break that same year for Waste Management's Emelle landfill.
Mabry is the fifth member of Siegelman's cabinet to appear at the grand jury.
Siegelman has not been charged by the grand jury, but a separate federal grand jury in Birmingham indicted him May 27. Also indicted were his former chief of staff Paul Hamrick and Tuscaloosa physician Phillip Bobo on charges of conspiring to rig bids on state medical contracts.
The former governor has maintained his innocence.