"It's been weeks. This is taking too long. We finally rounded up the four suspects, the four people seen ducking into nearby shops right around the time of death, got their statements and still don't know who the killer is. You were the first officer on the scene, right? You said you were nearby and saw someone with short hair and green clothes going in to the deli?"
"Right. And from other witnesses, we have that among the four, each went in to a different store: the deli, the pharmacy, the clothing store and the grocer's. Each had a different color of clothing: red, green, blue and yellow. Each was carrying something different: nothing, a shopping bag, a backpack and a briefcase. And each had a different hairstyle. The four hairstyles were different enough to be easily distinguished: short, long, bald and a mohawk."
"All we really have to go on are their hazy memories though.
Arden said, 'I was coming back from getting my mohawk done, but I don't remember where I went, not the grocer's though. ... I saw a couple other people walking around. One heading for the pharmacy had long hair. The other was wearing green.'
Blair said, 'I went to the grocer's that day. The only other thing I remember is seeing someone with yellow clothes carrying a shopping bag.'
Channing said, 'I remember going to the clothing store. ... I don't think I was carrying anything at the time. The only other person I saw was carrying a briefcase into the pharmacy.'
Devon said 'I wasn't wearing red that day. ... I saw someone with empty hands. They weren't wearing red either. ... There was also someone with a backpack and short hair.'"
"That's not much to go on, but it has to be one of them. They were the only ones in the right place at the right time."
"Yeah. Something about this doesn't add up though. Someone's lying and I have a feeling whoever it is is the killer."
Who was the killer?
This is version 2. The first version had a significant error that meant there was no solution.