"I'm a former Marine, and when the boss calls, you answer," Hillard said outside his south side home.
Hillard said he was contacted earlier in the morning by Mayor Richard Daley's office and asked to act as police superintendent until Daley exits as mayor.
"You don't get a chance like this to leave and then to have him come back and ask you to come back again, so I was really honored," said Hillard.
Though Daley wanted him to stay on past the expiration of his contract, Supt. Jody Weis' decided to leave the position after not receiving the written extention it's reported he wanted.
Hillard declined to comment on Weis' tenure as superintendent, but said that everyone is different and has their own way of operating.
As for holding the position beyond the interim, Hillard was quick to call it out of the question.
"When the mayor walks out of there... I will out there two steps behind him," he said.
Hillard previously served as superintendent from 1998 through 2003.