Murder, She Wrote S07E19 - Thursday's Child

Following an explosion at the school site that an architect designed, he is accused of setting the blast and then ultimately killing the jobsite manager when the manager was accused of unsafe and shoddy work on the job. The architect's mother is frantic to get the cops to uncover bribery in the city manager office and to find who really caused all the commotion at the job site, so she tries to convince Jessica that her son is the fruit of an affair she had with Frank while serving together during the Korean War.