Jonathan Ryder was arrested when a silver pin like the one his wife was wearing when she was killed was found in their home. Barbara Ryder, Jonathan's mother, was there when the detectives found that pin. She never mentioned then that there were four similar pins, a fact that was brought up only in trial.
The doctor/boyfriend identified Lois' pin as the one having a "B" etched into it but then goes on to say that she wanted (and got) an "L" (and would eventually add an "A" for daughter Allison.