9-1-1’s Evan ‘Buck’ Buckley and Eddie Diaz’s Friendship Timeline: From Strangers to Family

9-1-1’s Evan “Buck” Buckley and Eddie Diaz have been a beloved duo since the show’s second season — with some fans even hoping their friendship will turn into something more.

Buck and Eddie, portrayed by 

Oliver Stark and Ryan Guzman, respectively, became fast friends after Eddie joined the 118 during season 2. When a massive earthquake rocks Los Angeles during the first days of Eddie’s tenure, Buck drops everything to help ensure the safety of Eddie’s son, Christopher (Gavin McHugh). It’s a moment that Stark thinks cemented the duo’s friendship.

“We [see] Buck driving Eddie at the end of those episodes to go and pick up Christopher,” Stark exclusively explained to Us Weekly in 2022. “And I think that moment in itself was very meaningful. Eddie has a car he could have driven himself, but Buck was obviously wanting to extend an honest branch because of the things that they’ve been through. I think from that moment on it was pretty clear that they were willing to be a part of each other’s lives.”

Throughout the show’s six seasons, the twosome have since continued to show up for each other in both their personal and professional lives, with Buck even becoming a second father figure for Christopher. Their mutual inability to find long-lasting romance has also contributed to speculation that they are destined for more than just friendship.

Stark, for his part, believes the pair’s popularity is due to their “fun energy” that is “equally balanced with a deeper level of understanding and being there for each other.”

“They’ve both become quite embedded in each other’s lives,” he said. “I think they’ve kind of bonded and connected on so many levels, whether it be work, their personal lives and then add in that kind of fun dynamic where they clearly do just get on well. I think it’s just a nice recipe for a good relationship, however you choose to see it.”

Keep scrolling for a full timeline of Buck and Eddie’s friendship:

They Meet

Buck and Eddie first cross paths in the season 2 episode “Under Pressure” when Eddie officially joins the 118. While Buck initially feels intimidated by the new addition to the team, the pair quickly find common ground after they partner up to take a live grenade out of a 9-1-1 caller’s leg. When Eddie calls Buck a “badass under pressure,” their friendship is born.

Pseudo Parenthood

In season 2, when Eddie struggles to find permanent assistance with taking care of Christopher, who was born with cerebral palsy, Buck introduces him to home aide Carla (

Cocoa Brown), and the duo grow closer. Buck’s relationship with Chris also continues to deepen. (That will come back around later.)

A Major Disaster

In the season 3 premiere, Buck refers to Eddie as his “best friend” after he loses Christopher during a tsunami in Santa Monica. Once Chris is found, Buck becomes plagued by the guilt of having lost him in the first place until Eddie assures him that there is “there’s nobody in this world” he trusts with his son more than Buck.

Lawsuit Division

The twosome hit the first major bump in their friendship in season 3 when Buck files a lawsuit against the LAFD after Bobby (Peter Krause

) orders him to undertake light duties only while recovering from injuries sustained during the tsunami. They ultimately reconcile in the episode “Monsters” when Eddie realizes that Buck never intended to hurt the 118 with his actions.

When Buck notices Eddie is still acting off, he discovers his friend has been street-fighting in order to cope with his PTSD instead of attending therapy. Buck then invites Eddie and Chris over for pizza and video games in “Fallout,” where Eddie confesses that traditional therapy might not be for him. By the end of the episode, he admits that hanging out with Buck and his son does more for him than any professional help ever could.

A Christmas Trio

A favorite moment for “Buddie” fans, season 3’s “Christmas Spirit” sees Buck crafting a plan so that Eddie can be with Christopher on Christmas Day despite having to work. Buck brings the celebration to the 118, giving them the holiday they had hoped for.

“Christmas Spirit” is the second major holiday episode with the trio, as Buck and Eddie previously took Christopher to see Santa Claus during season 2’s “Ex-Mas.” While they were there, a stranger wrongly assumed that Buck and Eddie were a couple, saying they had an “adorable son.” Buck, however, did not correct the mistake.

Almost Lost

The 15th episode of season 13, “Eddie Begins,” highlights how deeply the duo care for each other. In addition to shining a light on Eddie’s backstory, the episode sees him propelling down into the ground to help save a young boy who is stuck in a pipe. When his cord gets cut 50 feet down, Buck starts to furiously dig with his bare hands into the mud — during a torrential downpour — in order to save him. Just as Buck completely breaks down believing he’s lost his best friend, Eddie appears and is safe.

Another Close Call

Almost exactly one season later, Buck stands in shock after Eddie is shot by a sniper in the season 4 episode “Suspicion.” Buck is forced to watch as his friend bleeds out in front of him and falls into a coma. Buck later breaks down in front of Christopher, who comforts him over his own father. Once Eddie awakens, Eddie tells Buck that if anything were to ever happen to him, he would want Buck to have custody of his son.

“No one will ever fight for my son as hard as you,” Eddie tells him, noting that he drew up the papers almost a year prior. When Buck asks why Eddie is telling him now, Eddie replies, “Because, Evan, you said you wish it had been you that got shot. You act like you’re expendable. But you’re not.” (Hearing Eddie use Buck’s proper first name? Buddie fans, IYKYK.)

Buck Shows Up

Although much of season 5 feels like a bit of a drought for the Buck and Eddie fans, the pair have a major moment in the 13th episode titled “Fear-o-Phobia,” when Eddie’s PTSD causes him to break down. As he destroys his bedroom, Christopher calls Buck, who rushes to Eddie’s side.

Lightning Strikes

The tables are turned in season 6 during “In a Flash” when Eddie watches Buck get struck by lightning. As the doctors scramble to save Buck’s life, Eddie breaks down in tears and screams at them to “do more” to save his best friend.

When Buck ultimately recovers, he returns home to find his new couch uncomfortable — so he heads to Eddie’s house to stay on his couch, instead. (We’re not saying the couch is a metaphor and Buck and Eddie are soulmates, but we’re also not not saying that.)

Another Life

While Buck is in a coma during the season 6 episode “In Another Life,” he imagines what the world would be if he wasn’t at the 118. When we meet the version of Eddie who doesn’t have Buck in his life, he’s become an angry man who recently lost custody of Christopher because he couldn’t handle being a single parent and a firefighter. It’s the butterfly effect of Buck introducing Eddie to Carla in season 2, but, with Buck in his life, Eddie isn’t a single parent either way.

Jealousy, Jealousy

The pair hit a rough patch in season 7, episode 4 when Buck finds himself increasingly envious of Eddie’s newfound friendship with Tommy (

Louis Ferrigno Jr.). From shipping himself a basketball at work to get invited to a pickup game to lifting heavy weights without a spotter and dropping hints about his free schedule, Buck continues to spiral over Eddie’s attention. Things take a turn for the worse at a basketball game, where Buck ends up knocking Eddie to the ground and sending him to the hospital.

The final moments of the episode reveal that Buck’s jealousy actually stemmed from wanting to get close to Tommy. While Tommy reciprocates the romantic feelings, Buck is still left having to pick up the pieces after making a mess of his friendship with Eddie.

Karaoke Bros

The BFFs quickly resolve their issues when Buck candidly comes out to Eddie as bisexual. They later let loose when the pair co-plan Chimney’s (Kenny Choi) bachelor party and throw an all night hangover-inducing rager while dressed as characters from Miami Vice.

A Shoulder to Cry on 

Buck shows up there for Eddie during the season 7 finale when Christopher, Eddie’s son, chooses to move to Texas with his grandparents. The decision comes after Eddie secretly starts dating someone who looks exactly like his late wife, Shannon, behind Christopher’s back.

Always Showing Up 

Buck appeared at Eddie’s door during the sixth episode of season 8 after being dumped by Tommy, who claimed that he would get hurt by Buck if they kept dating. The pair cracked open beers in silence to the tune of Risky Business’ “Old Time Rock and Roll” as Buck nursed his heartbreak. Oh, and did we mention Eddie wasn’t wearing any pants?

Saying Goodbye

Buck did not handle Eddie’s news that he would be selling his place and moving back to Texas to repair his relationship with Christopher well, going as far as to adopt a dog the team rescued on a call in season 8, episode 9. After accidentally breaking news of Eddie’s move to the rest of the team, Buck makes it up to him by secretly applying to become the new subletter of his house. The two share an emotional goodbye in season 8, episode 10, with Buck sporting a look of despair as Eddie drove away with his U-Haul.

Confused Feelings

While dealing with the absence of Eddie at the 118, Buck winds up having a one-night stand with Tommy in season 8, episode 11. The morning after, Tommy remarks that he’s glad “the competition’s out of the way,” referring to Buck’s close relationship with Eddie. When Buck notes that Eddie is straight, Tommy seemingly scoffs off the comment, stating, “OK.”

The conversation leads Buck to question how his friendship with Eddie is interpreted by others, especially during a conversation in which his sister, Maddie (Jennifer Love Hewitt), straight up asks him if he’s in love with his fellow firefighter. “As much as everyone seems to want me to be hopelessly pining for my straight best friend, it just isn’t like that,” he states. After Eddie leaves for Texas, Buck continues to support him by lending him advice via FaceTime calls.

A Sad Reunion

Buck and Eddie don’t reunite in-person until Bobby’s funeral in season 8, episode 16. On top of dealing with their grief in the following episode, Buck gets upset after Eddie reveals he was offered a job at a firehouse in Texas. The tension between the two comes to a head in a heated kitchen fight, with Eddie almost taking a swing at Buck.

Buck thinks Eddie has left for good after finding a note stating he went to the airport the next day. However, Eddie returns from the airport with Christopher, using the surprise visit — and a home cooked meal from his Tía Pepa (Terri Hoyos) — as a way to make amends.

A New Normal

Season 9 kicks off with the pair slightly at odds after Eddie shifts to work as Hen’s paramedic partner on the 118 team. As Eddie and Hen click instantly as friends, Buck — now working alongside Ravi —  finds himself jealous over losing Eddie as a partner. The two spend the majority of the season 9 premiere bickering, with Buck rolling his eyes when he finds out Eddie and Hen went to see an IMAX movie together. The twosome later argue over whose idea it was to dress up as aliens and scare Hen after she’s invited on a space mission. While Buck thinks it’s “weird” that Eddie and Hen fall into step quickly, Ravi points out that it’s “not” weird at all, as they’ve all been working together “for years.”