Hawaii 5-0 Season 10 Episode 20 Invitation to Murder

When artist Addison Barlow dies, the depth of his hatred for his relatives stands revealed: his will leaves his considerable estate to whomever is still alive after a year. His attorney, Malcolm Rhodes, regards this as an invitation to murder, and indeed the first victim falls at the reading of the will: Barlow's sister Laura dies of a poisoned aspirin. McGarrett, present at Rhodes's request, must discover who killed her before more Barlow relatives die.