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Captain Louis "Lou" Purnell Grover is a Chicago-born man who originally served as the captain of the Honolulu Police Department's SWAT team before retiring from his position for good in the aftermath of the events in the Season 4 finale episode, O ka Pili'Ohana ka 'Oi.

He is the father of Samantha and Will and a member of the Hawaii Five-0 Task Force led by Lieutenant Commander Steve McGarrett.


Early life[]

A 25-year veteran of the force, Grover was Born and bred in Chicago. He graduated from the Chicago Police Academy in 1989, and was promptly recruited by the FBI to go undercover in the Philadelphia Black Mafia. Upon the completion of the assignment, he returned to the Chicago Police Department. He left Chicago around 2012 or 2013, after an incident where he blamed himself for having failed to save a boy who was taken hostage by his father, which ultimately resulted in a murder-suicide. Despite Grover's best efforts, the man ended up killing his son and then himself. [1]

Unable to cope, Grover intended to commit suicide, but was inadvertently saved by his son, Will, who decided to skip school when the latter broke something in the kitchen. Needing a change of scenery, he and his family leave Chicago for good and relocate to Hawaii, joining the HPD's SWAT team and becoming captain.

Season 4[]

Grover made his first appearance in Aloha ke kahi I ke kahi where he and his SWAT responded to the hostage crisis inside Iolani Palace, the headquarters of the Hawaii Five-0 Task Force. He later became an enemy of Five-0's leader, Lieutenant Commander Steve McGarrett who was attempting to free members of the National Liberation Movement due to the fact that the NLM's leader had taken Steve's girlfriend Lieutenant Catherine Rollins hostage.

Grover filed a complaint against Steve with the governor. However, in the episode Akanahe, Governor Samuel Denning ordered Steve and Grover to work together to bring a summons for Ian Wright and deliver him to the courthouse. However, the situation turned into a kidnapping, and eventually to Grover and Steve having to release Ian when he hacked into the plane, threatening to crash unless he was released. The Governor later commended both the men, saying they made the right decision.

In the episode O kela me keia manawa, Steve found out that his suspect in a case, Jack Anderson, was a friend of Grover's, and let him be a part of the case to track down Jack. Eventually, they found out Jack was actually a wanted man, and Steve and Grover headed to the forest to find him. Though held at gunpoint by Jack, Grover was able to overpower him when Steve created a distraction.


Captain Lou Grover in the H50 Season 4 finale episode, "O ka Pili'Ohana ka 'Oi- Family Comes First".

In O ka Pili'Ohana ka 'Oi (episode), hacker Ian Wright returned, targeting Grover's daughter, Samantha. He kidnapped her and made Grover steal $100 million worth of drug money that Five-0 was helping to transport to aid Third World countries. He and Ian's men end up taking the Five-0 team hostage, but they were surprised when the money is missing. Grover killed Ian's men when they tried to kill the Five-0 team, and Grover finally admitted to Steve that Ian Wright had Samantha.

Steve and the team helped Grover track the money to the DOD agent who originally provided the money and a local gang who was helping him transport the money. Before they could hand over the money, though, Grover got a call that Samantha came to HPD headquarters, and said that Ian is dead after Wo Fat shot him and freed Samantha.

Though the money was recovered, Grover was forced into early retirement as a result of the incident. However, Steve offered Grover a place on the Five-0 team.


Grover holding his new Hawaii Five-0 badge. From the Season 4 finale episode, "O ka Pili'Ohana ka 'Oi- Family Comes First".

Despite being reluctant at first, Grover eventually accepted, which resulted in him becoming the newest member of the Hawaii Five-0 Task Force team and overall the fifth and final member of the team.

Season 5[]

In the Season 5 premiere episode, A'ohe kahi e pe'e ai, Grover worked his first ever case as a member of the Five-0 team and was even seen wearing his own version of the team's tac vest.

In Ina Paha, Grover meets Sang Min for the first time. In the alternate reality, he is seen arguing with Duke Lukela about his golf clubs being stolen, only to be later interrupted by Steve's arrival.

Season 6[]

In Season 6 episode 19, Grover and his family have to go on the run because of a case he went on in '89. On the case Lou, fresh out of the academy, is sent undercover in Philly, to take down the black mob. He does and the leader Barnes and his son Barnes Jr. are put in jail. His handler Agent Zaglar, talks to him outside of the restaurant him and Steve are eating at. After talking to his handler, he and his family go on the run. At the end of the episode, Lou and his family are found in the woods by Steve.

Season 7[]

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Season 8[]

In What is Gone is Gone, Grover comes across a man accused of murdering his wife intending to commit suicide and went to speak with him and talk him out of doing it by telling him about the same situation he was in, until the team eventually found evidence proving his wife committed suicide.

Season 9[]


As the head of HPD's SWAT division, Grover originally had little or no patience for the Hawaii Five-0 Team, believing that they often went too far and that they needed to follow the law.

He regularly clashed with Steve McGarrett, the two men often coming close to butting heads due to the fact that they had completely separate ideas of how to do things.

By the end of Akanahe, Grover and Steve had developed a strong, almost grudging respect for each other although they still remained hostile towards one another.

While the two have formed a strong bond, in Pale'la, Grover told Steve the real reason he left Chicago was the result of a murder-suicide involving a father and his child. That trust grew between them when Steve revealed in the next episode, about Freddie Hart and his death. Still, Lou still likes to make fun at Steve's expense, like when he caught a large fish that McGarrett failed to do on his first try at Spearfishing and insisted that Chin takes a picture and send it to Steve to annoy him.

Lou also has a witty and sarcastic sense of humor, often spouting some of the best one-liners in the series.


  • Put his old friend Clay Maxwell behind bars on multiple charges, including the murder of his wife. [2]
  • Carries a Kimber Warrior as his own personal sidearm with the weapon sometimes being fitted with a Streamlight TLR-2 weapon light.


  • The character was named after a Captain Grover (Scott Brady) from the original series.



Season Four
Aloha ke kahi I ke kahi A'ale Ma'a Wau Ka 'oia'i'o ma loko A ia la aku Kupu'eu Kupouli 'la Ua Nalohia Akanahe Ha'uoli La Ho'omoaika'i Ho'onani Makuakane Pukana
O kela me keia manawa Hana Lokomaika'i Na Hala a ka makua Pale'la Hoku Welowelo Ma lalo o ka ili Ho'i Hou Ku I Ka Pili Koko Pe'epe'e Kanaka Makani 'Olu a Holo Malie O ka Pili'Ohana ka 'Oi
Season Five
A'ohe kahi e pe'e ai Ka Makuakan Kanalu Hope Loa Ka Noe'au Ho'oilina Ho'oma'ike Ina Paha Ka Hana Malu Ke Koho Mamao Ak Wawahi moe'uhane Ua'aihue Poina 'Ole La Po'ino
Powehiwehi E 'Imi pono Nanahu Kuka'awale Pono Kaulike Kahania Ike Hanau Ua helele'i ka hoku Ho'amoano Mo'o 'olelo Pu Luapo'i A Make Kāua
Season Six
Mai ho`oni i ka wai lana mâlie Lehu a Lehu Ua 'o'oloku ke anu i na mauna Ka Papahana Holo Pono Ka 'alapahi nui Na Pilikua Nui Na Kama Hele Piko Pau 'iole Hana Keaka Ka Makau kaa kaua Kuleana Ua Ola Loko I Ke Aloha Umia Ka Hanu
Hoa 'Inea Ke Koa Lokomaika'i Ka Pohaku Kihi Pa'a Waiwai Kanaka Hahai Malama Ka Po'e Ka Haunaele Ka Pono Ku'oko'a I'ike Ke Ao Pilina Koko Pa'a Ka 'Ipuka I Ka 'Upena Nananana O Ke Ali'I Wale No Ka'u Makemake
Season Seven
Makaukau 'ce e Pa'ani No Ke Ali'i' Wahine A Me Ka Aina He Moho Hou Hu a'e ke ahi lanakila a Kamaile Ke Ku 'Ana Ka hale ho'okauweli Ka makuahine a me ke keikikane Hana Komo Pae Elua la ma Nowemapa Ka Luhi Ka’ili aku Ka 'Aelike Ua ho'i ka 'ōpua I Awalua
Ka laina ma ke one Ka Pa'ani Nui Poniu I Ke Aloha Hahai i nā pilikua nui E mālama pono Puka 'ana Huikau nā makau a nā lawai'a Ua malo'o ka wai Waimaka 'ele'ele Wehe 'ana He ke’u na ka ‘alae a Hina Ua mau ke ea o ka 'aina i ka pono
Season Eight
Fire Will Never Say that It Has Had Enough Dog Days Your Knife, My Back. My Gun, Your Head No Matter How Much One Covers a Steaming Imu, The Smoke Will Rise At Kama'oma'o, The Land of Activities Unfolded by the Water are the Faces of the Flowers The Royal Eyes Rest Above The Trail Leads To A Diving Place; Do Not Follow After Death at Sea The Future is in the Past A Tall Tree Stands Above the Others The Round Up What is Gone is Gone
The Children of Kalaihaohia A Coral Reef Strengthens Out into Land Only the Stars of Heaven Know Where Pae Is The Fire Blazed Up, Then Only Ashes Were Left To Do One's Duty No One Has Ever Died For the Mistakes He Has Made; Only Because He Didn't Repent Kind Is the Bird of Kaiona The Answer to the Riddle is Seen Though the Fish is Well Salted, the Maggots Crawl What Parents Will Do, Children Will Do The Tough Branch That Does Not Break in the Kona Gale Ancients Exposed
Season Nine
Cocoon The Man Who Fell from the Sky When the Sea Draws Out the Tidal Wave, the Rocks Where the Cowries Hide Are Exposed On the Slope of the Cliff, Not One Jutting Rock is Hidden from Sight Nothing More the Eyes to Search For Is Borne on the Back; Is Borne in the Arms The Smoke Seen in the Dream Now Rises Birds of a Feather... Truth Comes from the Night When the Light Goes Out, the House Is Dark Gone on the Road from which There Is No Returning A Bruise Inflicted on an Innocent Person Vanishes Quickly Those Above are Descending
Depressed with the Heat of Kealwalua Made Prisoner by the Reign of the Rain When Covetousness is Conceived, Sin is Born Offer Young Yaro Leaves to He Who Eats 'Ape is Bound to Have His Mouth Itch The Octopus of the Deep Spews It's Ink Way of the Gun Offspring of an Owl The Teacher, the Pupil - Let it Come Forth A Stranger Only for a Day The Hand is at Fault Endlessly Pours the Rain of Waianae
Season Ten
The Skin Has Been Hurt by the Point of the Spear Knocked Flat by the Wind; Sudden Disaster Passing Time Obscures the Past Tiny is the Flower, Yet it Scents the Grasses Around It Don't Blame Ghosts and Spirits for One's Troubles; a Human is Responsible All Knowledge is Not Learned in Just One School DNA That Way and This Way Shifts the Sand of Punahoa The Trunkless Tree of Kahilikolo You and Me, It Is Hidden To Return Evil for Evil Where Were You When the Rain was Pouring? The Rat was Caught Right in the Nest
There Was a Lull, and then The Wind Began to Blow About Yours is the Mouth of an Octopus Man is a Slave of Love Like a Whirlwind, Whirling the Dust Upward Lost in the Sea Sprays Home Go the Very Tough Lads of the Hills A Gripping Cuttlefish He Cannot be Caught for He is an Ulua Fish of the Deep Ocean Goodbye


Hawaii Five-0 Characters
Final Steve McGarrettDanny WilliamsAdam NoshimuriTani ReyJunior ReignsLou GroverKamekona TupuolaDuke LukelaNoelani CunhaQuinn Liu
Former Chin Ho KellyKono KalakauaMax BergmanCatherine RollinsJerry Ortega
Other Lori WestonMary McGarrettGrace WilliamsCharles WilliamsJenna KayeDr. Malia Waincroft