Justin Foster, 28, appeared at a bail hearing on Thursday in the suburban Chicago city of Des Plaines, where shocking new details of the horror attack emerged.
Prosecutors said at the hearing that Foster, outraged over a new man who was dating his ex-girlfriend, flew to Chicago O'Hare International Airport in March, the Chicago Tribune reported.
Although Foster is from Tallahassee, Florida, he flew to Chicago from Atlanta, according to prosecutors.
Once at O'Hare, Foster rented a car and sought out the 26-year-old man who is the object of his jealousy, authorities say.
The prosecution alleges that once Foster located the man, he hit him over the head with a tire iron, carved his initials into his leg, and cut off his penis.