Originally Posted by maximoi

Ok good to know but here is a thought.

Guess what? Lane and Layne (the girls last name) sound exactly the same right? So when the dude was hearing "lanes" he could've understood it as "Layne's" as in the Layne's residents front door. So if he was innocent he would've gone to the Layne's house (this is assuming he knew where she lived) and found no green pen, but instead he went to the bowling lanes and found it where they found the body, but I guess this puzzle can be flawed if people call it bowling lanes too.