Family:
Clark Hudson (Father)- S1
Eli Hudson (Cousin)- S2
Tina Hudson (Aunt)- S2
Love Interests:
Emma Duval- S1/S2
Haley Myers- S2
Piper Shaw- S1
Enemies-
Everyone (besides Piper Shaw)
In the first season, Kieran met Emma at a party being thrown by Brooke. He kissed her, and they started a friendship. Kieran fought with Emma's ex Will over her. Will eventually began to win Emma back, irritating Kieran. However, after a video of Will and Emma having sex leaks, Emma begins dating Kieran. They keep their relationship secret, as Emma's mom and Kieran's dad are dating. After Will is kidnapped, Emma saves him. She plans a date with him. This worries Kieran. Will is later murdered. Emma's relationship with Kieran takes a turn when evidence implicating Kieran as the killer is found. However, after Kieran's dad dies, he is cleared, and Emma and Kieran continue dating.
Emma decides she needs time to heal from the events in Season 1 and breaks up with Kieran, leaving for a three month retreat that begins to help her heal emotionally from the suffering she endured.
They start up their relationship again at the beginning of Season 2, however, it becomes complicated further when Kieran tells the police Emma has the deceased Jake Fitzgerald's cellphone. Their relationship gets worse when Kieran goes behind her back and tells the police about the encounters she had with the Killer, and Emma starts to hang out with Kieran's cousin, Eli Hudson. They appear to have an "on and off and on again" relationship.
Eventually, after Kieran's "abduction" by the Killer, the two appear to have made up again after Kieran reveals the truth about the car accident and Emma keeps her distance from Eli, not trusting him anymore.
Their relationship comes to a final end in When a Stranger Calls when Kieran is revealed as the Killer, having only pretended to love Emma.
Death
In prison, Kieran, hearing a noise, looks up to see a person in the Killer's costume laying face down in the ventilation vents above him, looking down at him. Nervous of what the killer will do, Kieran tells the nearby security guard that he needs to "use the can". The security guard refuses while writing notes down on a pad nearby.
The Killer slightly opens the vent, but the guard hears the vent creaking. When he turns around in surprise, the Killer jumps out of the vent and murders the guard by twisting/snapping his neck 180 degrees, while Kieran watches in shock from inside his cell, amazed at the killer's superior brutality.
The Killer then takes the guard's keys, lets Kieran out and confronts him. "Alright. You kept your word. So you're going to tell me who you are?" Kieran asks. The Killer stares silently for a few seconds before giving his response: swiftly gliding the hunting knife across Kieran's throat, slicing it open. A horrified Kieran gurgles while blood spurts out.
Completely dumbfounded and full of bewilderment, a gurgling Kieran drops to his knees and falls to the ground. As Kieran clutches his neck, bleeding profusely, he sees that the prison guard dropped his gun.
He desperately attempts to crawl toward the gun, but the Killer pins him down. The Killer then strikes the knife down into Kieran in the back of the neck, twisting it, finishing him off. He then turns Kieran's corpse over and admires his work as Kieran's corpse continues to bleed out.
