"We just got a good lead this morning. I'm not going to get into it. We've been really frustrated," said Supt. Weis said at a police commendation ceremony Wednesday.
Officer Bailey was shot to death while cleaning his car outside his home 7400-block of South Evans Avenue on July 18. The veteran officer had just gotten off overnight duty guarding the home of Mayor Daley.
Good leads in the investigation have been hard to come by.
"We've been encouraged before but unfortunately it didn't pan out. But we've got our guys working it hard, talking to the community," said Supt. Weis. "We're going to keep working till we find those responsible and bring them to justice."
Officer Bailey is the third Chicago police officer murdered in recent months. Officer Thor Soderberg was shot to death on July 7 and Officer Thomas Wortham was shot during a robbery attempt on May 19. Police quickly charged suspects in those cases but the Bailey investigation has gone on for five weeks and counting.
Bailey's sister, Valerie Ewing, told ABC7, "it's been frustrating. We're trying to be patient and let police do what they do." Ewing says she was unaware of the latest tip investigators got that they hope will lead to a suspect.
"We just got a good lead this morning. I'm not going to get into it. We've been really frustrated," said Weis.
The Bailey family, along with families of other officers and firefighters, was honored this weekend at a department baseball game at U.S. Cellular Field.
"They're doing terrific. As terrific as a family can do after they've endured that loss. But there's a lot of strength in that family. There's a lot of love, there's a lot of compassion and they lean on each other when they need to," said Weis.
Police have a general description of a man running from the scene the morning officer Bailey was killed. He was wearing a white t-shirt and denim shorts with an orange and black belt. But that's it.
Last month Bailey's family moved out of the Park Manor home where he was killed.