Did Lucas kill Alison

In the context of the show "Pretty Little Liars," Lucas Gottesman is not the one who killed Alison DiLaurentis. Although he is a complex character with his own struggles, the series reveals that Alison's death was a result of other characters' actions, and Lucas is not directly involved in that event. The mystery surrounding Alison's death is central to the plot, with various characters suspected throughout the series.