Around the final story arc of the comics, Homelander figured out the loyalties of Queen Maeve and Starlight, realizing that both had been working with The Boys. ... Homelander easily overpowers her and beheads her. Starlight survives in the end and owes her life to Queen Maeve.
Who kills Starlight?
The scene in question happens when Hughie is dying and a reluctant driver refuses to give the heroes his car to drive him to the hospital. In a rush decision, Starlight kills him. While on an episode of Collider's Ladies Night, Moriarty discussed Starlight's actions.
What did Homelander do to Starlight?
Similarly to the show, Starlight is coerced into performing oral sex on Homelander, Black Noir, and A-Train. She continues to be mistreated but gradually learns to stand up for herself, particularly in her interactions with A-Train. This culminates in Starlight temporarily blinding him when he attempts to rape her.