The murder happened when they were 16/17. The victim was 17 years old and he was found strangled to death in his car after last being seen alive with these guys. The murder is apparently still unsolved, the victim's money and items were not stolen so they couldn't figure out what happened, it happened in a small town, population around ~10,000. I met them and they seem like laid back, very intelligent, friendly gentlemen, good to chat with. I found out about this murder after talking with them. But I'm wondering if I should pursue the relationship with them further or drop it. Not entirely sure what 'insufficient evidence' means, but that's the exact phrasing I read. (In case anyone's wondering, I have GAD and I'm naturally very paranoid and I sometimes do background checks on new friends I meet)