9. Anna Palmer, Murder, 1998
Anna Palmer, a 10 year old was repeatedly stabbed and killed outside her own front door in Salt Lake City, in 1998. Unfortunately, the case remained unsolved due to lack of evidence and witnesses. In 2009, using new technology, forensic analysts managed to get DNA evidence from under Anna’s nails. The DNA matched to one Matthew Brock, who lived a block away at the time of the murder and was 19 years old at the time. When charges were filed, he was already serving a 10-year sentence for sex related crime with a child. He pled guilty in 2011, and was sentenced to life in prison.