On June 10, 2012, Jackson took a medical leave of absence from the House, citing exhaustion. On July 11, 2012, Jackson's office said he was being treated for a mood disorder at a residential treatment facility. His office denied speculation that he was being treated for alcoholism. However, he also acknowledged that he was under two separate and distinct investigations, by the House Ethics Committee and by the FBI
On August 13, 2012 it was confirmed by numerous news outlets that Jackson was in fact being treated for bipolar disorder. Sixteen days after being re-elected to another term, Jackson resigned effective on November 21, 2012, citing his health problems and acknowledging the ethics investigations.
Misuse of campaign funds
Federal prosecutors investigated alleged misuse of Jackson, Jr.'s campaign funds by Jackson, Jr. and his wife Sandi. Jackson, Jr. and Sandi Jackson signed plea agreements in early February, 2013. Jackson, Jr. agreed to plead guilty to charges of fraud, conspiracy, making false statements, mail fraud, wire fraud, and criminal forfeiture. Jackson, Jr. used about $750,000 in campaign money for personal expenses that included a Michael Jackson fedora and cashmere capes. Jackson, Jr. also agreed to prison time. The Justice Department filed the charges on February 15, 2013. Jackson pleaded guilty on February 20, 2013 to one count of wire and mail fraud in connection with his misuse of $750,000 of campaign funds. Sentencing is scheduled for June 28, 2013. On June 7, 2013, federal prosecutors indicated that they sought a 4 year prison sentence for Jackson, Jr.