2x27 - Perry Mason

Martin Selkirk is a major league rotter who wants Claire Allison in the worst way even though she's dating Dirk Benedict. Selkirk has Dirk's jaw broken and begins sending Claire threatening mail. Then Selkirk is murdered in his beach house and Claire is arrested for the crime. Perry takes the case and finds that the evidence points in the direction of Selkirk's five year old son. Or does it?