Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A 63-year-old man has been arrested on suspicion of the brutal sex killing of teenager Melanie Road who was stabbed to death 31 years ago. Police confirmed a DNA breakthrough had led to the man, from Bristol, being arrested in connection with the death of the 17-year-old. Melanie was last seen alive in the early hours on June, 9, 1984 following a night out with her friends in Bath, Somerset. The A-level student was found the following day having died from multiple stab wounds to her chest and back. She had been sexually assaulted. Avon and Somerset Police confirmed an arrest in connection with the long-running investigation made yesterday.Man, 63, arrested in connection with the 1984 murder of Melanie Road17-year-old student was sexually assaulted and stabbed to death in BathBody found by a milkman after she failed to return home from a night outPolice confirmed DNA breakthrough had now led to suspect being arrested 
 Question:'We are now cross checking that _ with that of all the people with links with Melanie or who we know were on Bath at the time and may be of interest.

DNA