Eyewitness News doesn't yet know how this person is connected to the case.
If you know where Cathy Lu is, give police a call and send her their way.
Detectives need to talk to her about the abandoned newborn that was found Sunday night behind the Woodside Houses.
She was just a few hours old, wrapped in a sheet and left lying in a grassy area.
Workers at Elmhurst Hospital say they got a lot of calls from people who want to adopt her.
That baby girl was released around 2 p.m. Thursday.
She is doing well and is now in foster care.
If you have any information about Cathy Lu please call Crime Stoppers at 800-577-Tips.
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