“So, if someone shares a lot of DNA that means they’re related, and when we are talking about related, these are typically very distant relatives,” Dr. Ellen Greytak said. “So, we are excited, very excited to see a second cousin. But most of the time we are seeing people at sort of the third cousin level, so we are very distant. These are people in GEDmatch, almost certainly do not know this suspect personally, but their DNA ties them together.”