Darwin Sorells, 26, and 22-year-old brother Derren, who are both documented gang members, were charged with first-degree murder Sunday over the death of Aldridge, 32, a mother-of-four.
Both are repeat gun offenders, Chicago Police Superintendent Eddie Johnson confirmed, and both were out on parole at the time of the killing.
Speaking about Darwin, Johnson said he is a six-time weapon offender who was jailed in 2013 for six years for another gun crime but released on parole in February.
Meanwhile Derren had been released early after a vehicle theft charge and was wearing an electronic tag when Aldridge was shot.
Johnson said the tag was turned off at the time of the murder under city regulations that allow criminals a certain number of 'free hours' each day.