Chicago......has dead people on the voter lists.
Every jurisdiction in America has dead people on their voter lists. At this moment in Florida, for example, there are X number of registered voters on the list maintained by the state Division of Elections. Today, some of them will die but the list is not instantly updated with each death. So, you end up with the names of these dead people on the voter lists.
The lists are updated, on a schedule dictated by the availability of the data. That is done partly by cross-checking the lists against the death certificates that are submitted to the Department of Health. The Division also uses the National Change of Address database and the Social Security Death Master File to identify deceased voters.
However, the instant such updates are done, people keep dying and the names of new dead people will again appear on the list. In effect, there is never a time in any jurisdiction where there the names of deceased people are not on the registered voters list.
For some reason, Chicago is frequently cited as a hotbed of dead people voting. There is some truth to that, but it is hardly a hotbed. It seems to be mostly clerical errors. According to
this source, "In all, the analysis showed 119 dead people have voted a total of 229 times in Chicago in the last decade." With about 1.5 million registered voters in Chicago, that is a minuscule number that suggests the Chicago voter lists are well maintained and are as current as can reasonably be.