DNA

It was true that so far Rufus's DNA wasn't on the national database, but he was skating on thin ice!

There would have been a smelly pile of DNA on Marcus's body and probably DNA from the scene of the girl's strangling that would tie the two events together. And, whilst unlikely, if anyone happened across Roger's body, there would be another DNA link.

All it would take was for Beth to report her rape and Rufus was really in the do-do. And the murder of his dad and partner would be reopened.

Testing times for a serial killer!