Everybody keeps mentioning it is the same date that Samantha Clarke disappeared...HOWEVER, if you followed Samantha's case at all, you would know that the person responsible for her disappearance is in jail for murdering and kidnapping Alexis Murphy. There are phone records of it. He called her right before she left her apartment. She was never seen again.
The police have all the evidence except for her body and without that the case is very circumstantial. Hannah's disappearance has nothing to do with Samantha Clarke. However, it may be related to Morgan Harrington's case as it is close to the exact date that she disappeared from UVA in 2009. The whole regional area has a lot of women disappearing. There may be a serial killer or just several killers?