meco03211 , 5 hours ago

Easy. You have 11. Eliminate the women because they would know it’s male based on DNA. Now we’re at 6. 4 were verifiably in different states at the time of the crime. 2 left. Stake them out for a bit and gather some garbage likely to have DNA. 1 sample is a perfect match.

Alternatively, those last 2 sample could both not match and then they just continue their investigation.