[4] Zizzo dropped out of high school and began working as a truck driver for the Chicago Outfit, the city's dominant organized crime syndicate.
[4] Throughout the 1970s and 1980s, Zizzo was involved in a number of high-profile criminal activities, including illegal gambling, loan sharking, and extortion.
[6] Zizzo disappeared after leaving his home on August 31, 2006, he was last seen outside a Melrose Park restaurant where his car was found after a missing person's report was made by his wife.
[8] Theories on why Zizzo may have been targeted include fears he might testify against the Outfit as well as an ongoing feud with powerful captain Michael Sarno, whom he was supervising.
[3] The FBI considers Joseph Andriacchi a prime suspect in the 2006 disappearance and presumed murder of Zizzo, and offered a $10,000 reward in 2016 for information that would help to solve the crime.