Holly Piirainen- A 10yr old child missing and the case goes cold, quickly. Until 2012!

Holly Piirainen, 1993-A ten year old girl, visiting for the summer, she goes to visit puppies down the street. Her little brother returns alone and only one Holly's shoe was found. Some new developments arise in 2012. DNA was found on some of Holly's items, a person of interest was named, but they refuse to call him a suspect, Why? Is this case connected to the Molly Bish case?