In 1809 he was expelled from the London Stock Exchange for "gross and nefarious conduct". In 1812 he was convicted of defrauding Thomas Plumer of a considerable sum of money. Walsh was pardoned by the Prince Regent, but was expelled from the House of Commons. In 1813 Walsh purchased a Plymouth newspaper which subsequently failed in 1816.
One of his sons was Benjamin Dann Walsh who emigrated to the United States in 1838 and became a notable entomologist.
- "WALSH, Benjamin (b.c.1775), of Lower Clapton, Mdx. | History of Parliament Online". www.historyofparliamentonline.org.
- O'Danachair, Donal, ed. (2009). The Newgate Calendar, Vol 5 (PDF). Ex-classics Project. pp. 275–278.