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FILE - This June 15, 2012 file photo shows Michael J. Fox speaking at the Middlesex Community College Celebrity Forum in Lowell, Mass. Fox is spending Tuesday participating in the Cantor Fitzgerald Relief Fund's Charity Day, along with a host of other celebrities. Cantor Fitzgerald, the financial firm that lost 658 employees in the attacks on the World Trade Center in 2001, hasmarked the anniversary of that day by raising funds charities; this year, more than 100 are expected to benefit. (AP Photo/Michael Dwyer, file)

Associated Press
FILE - This June 15, 2012 file photo shows Michael J. Fox speaking at the Middlesex Community College Celebrity Forum in Lowell, Mass. Fox is spending Tuesday participating in the Cantor Fitzgerald Relief Fund's Charity Day, along with a host of other celebrities. Cantor Fitzgerald, the financial firm that lost 658 employees in the attacks on the World Trade Center in 2001, hasmarked the anniversary of that day by raising funds charities; this year, more than 100 are expected to benefit. (AP Photo/Michael Dwyer, file)
FILE - This June 15, 2012 file photo shows Michael J. Fox speaking at the Middlesex Community College Celebrity Forum in Lowell, Mass. Fox is spending Tuesday participating in the Cantor Fitzgerald Relief Fund's Charity Day, along with a host of other celebrities. Cantor Fitzgerald, the financial firm that lost 658 employees in the attacks on the World Trade Center in 2001, hasmarked the anniversary of that day by raising funds charities; this year, more than 100 are expected to benefit. (AP Photo/Michael Dwyer, file)
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