Lyla Garrity

In the pilot episode, Lyla is introduced as the girlfriend of star quarterback, Jason Street. After Jason's accident, she cheats on him with Riggins, his best friend, while Jason is in the hospital. Jason find out about the affair and confronts both Lyla and Riggins. For some time, the relationship between her and Jason is strained, but they get back together as he admits that he still loves her despite everything that has happened[2] and he proposes to her. Her parents' messy divorce and her father's affair being made public takes a toll on her and, during the father-daughter dance, she takes out her anger at her father's infidelity by vandalizing her father's car dealership and the cars on sale. Her troubles are exacerbated when she catches Jason with a woman he has met while training for the Olympic trials in Austin and breaks off the engagement.[3] She eventually quits the cheerleading squad after being incessantly ridiculed by her peers at school and does some soul-searching.

In the season premiere, Lyla becomes a devout Christian. She is baptized in the first episode of the season and becomes involved in various ministries such as a Christian radio show and prison ministry. At the radio station, she meets Chris (Matt Czuchry), and they begin dating. While on a visit to juvenile detention, she meets the gruff but polite, Santiago. She learns that he was born on American soil but his parents, being illegal immigrants, were deported back to Mexico several years ago and that he lives with his relatives. She convinces her father to offer Santiago a job at the car dealership. Buddy later recommends him to Coach Taylor and Santiago tries out for the Panthers football team with some help from Tim, Matt Saracen, and Brian "Smash" Williams.

Meanwhile, Jason and Tim have gone to Mexico because Jason wants to try an experimental procedure in hopes of regaining use of his legs. Lyla comes to Mexico at Tim's request. The three go on a “booze cruise “ where Tim and Lyla plan to talk Jason out of the operation. Jason intentionally falls out of the boat, but swims safely to a beach. Lyla and Tim meet him at the beach and the three return to Dillon.

Lyla is now a senior and starting to plan for her future. Having made peace with Jason, she and Tim reconnect romantically. She fights with Buddy after he loses her college fund money in a bad business deal, even living with Tim for a while, but they eventually reconcile. At the end of the season, she leaves Dillon for Nashville to attend Vanderbilt University. The character was written out of the show as actress Minka Kelly departed from the main cast for other acting opportunities.

Lyla returns to Dillon and attends the funeral of Matt's father. She reunites briefly with Tim, who admits that he is still in love with her, but realizes that asking her to stay will mean holding her back. They part ways amicably, and say their goodbyes as Lyla boards a bus back to Vanderbilt.[4] This is Minka Kelly's final appearance in the show.