Embattled Congressman Jesse Jackson Jr., who has been under a cloud of suspicion since he disappeared from Congress to go on medical leave in June resigned from his post Wednesday.

Michael Steel, a representative from House Speaker John Boehner's office told theGrio "We received the letter," but didn't give any details on why Jackson said he is resigning.This resignation comes just weeks after Jackson Jr. reclaimed his seat in a landslide, grabbing 63 percent of votes cast during the 2012 election--no surprise in the heavily Democratic 2ndCongressional District he's served for about 18 years.

Local reports said Jackson Jr. notified supporters, staff and some lawmakers Wednesday afternoon, "citing health reasons."

"My health issues and treatment regimen have become incompatible with service in the House of Representatives. Therefore, it is with great regret that I hereby resign ... effective today, in order to focus on restoring my health," Jackson Jr. wrote in a two-page letter to House Speaker John Boehner.

Addressing an FBI probe, Jackson in the letter admitted to "my share of mistakes," saying: "I am aware of the ongoing federal investigation into my activities and I am doing my best to address the situation responsibly, cooperate with the investigators, and accept responsibility for my mistakes, for they are my mistakes and mine alone."

In early June, Jackson Jr. took a medical leave of absence and had reportedly been receiving treatment for depression and gastrointestinal issues at the Rochester, Minnesota-based hospital, until his release in early September. Between early September and late October, Jackson Jr. was convalescing in his Washington D. C. home where he saw doctors twice a day. He returned to the Mayo Clinic at that time to undergo more tests, his father, civil rights leader Rev. Jesse Jackson, told theGrio.

Jackson Jr. left the Mayo Clinic last week, a spokesman from the hospital said. CBS Chicago reported that Jackson Jr. was in an undisclosed location with a relative, but neither in Chicago nor Washington.

Over the last few weeks, Illinois politicos have been calling for Jackson to make a statement to constituents, updating them on his status and whether or not he plans on returning to office.

Jackson Jr. is reportedly working on a plea deal with federal prosecutors who are investigating him for possible misuse of campaign funds.  Washington lawyers and top criminal defense attorney Dan Webb, who struck a plea deal for the late Illinois Rep. Dan Rostenkowski in the 1980s, is negotiating a plea bargain for Jackson Jr. that may be reached by the end of the year.