In a more dramatic subplot, Nahele Huikala’s father, an ex-con, returns and seeks custody of him. Nahele eventually reveals a dark secret: he witnessed his father commit a murder before going to prison. Steve McGarrett later recovers the body of the victim, leading to the father's arrest. Key Episode Details Hana Keaka | Hawaii Five-O Wiki | Fandom
The investigation reveals the professor was using a failing nail salon as a front for a marijuana-growing operation. He was eventually killed by his student and business partner, Alfie "Tuck" Tucker, who grew greedy. [S6E9] Hana Keaka
The episode features a mix of a lighthearted undercover mission and a more serious personal subplot: In a more dramatic subplot, Nahele Huikala’s father,