Contrary to popular belief, the decision to kill off Ana Lucia and Libby in Lost season 2 was not due to the DUI arrests of the actors who played them, Michelle Rodriguez and Cynthia Watros. The characters were introduced as survivors from the tail section of the crashed plane, separate from the main group. Ana Lucia's combative behavior and accidental murder of Shannon drew backlash from audiences, while Libby had a charming relationship with Hurley.

In the episode "Two for the Road," Ana Lucia and Libby were shot by Michael, who had been coerced by The Others. The arrests of Rodriguez and Watros for DUI occurred around the same time, leading to the misconception that their real-life misbehavior resulted in their characters' deaths.

However, Ana Lucia's death had been planned from the beginning, as Rodriguez didn't want to continue beyond one season. The decision to kill off Libby was made due to Ana Lucia's unpopularity, aiming to create a more shocking and emotional moment.

Lost episodes were written and filmed in advance, debunking the notion that the characters' deaths were a response to the actors' arrests. Rodriguez had already signed on for only one season, and the plan was to bring Libby back in future seasons to explore her mysterious past.

Unfortunately, Watros' availability for subsequent seasons was limited, but she did make a few appearances and reunited with Hurley in season 6.

In conclusion, the deaths of Ana Lucia and Libby in Lost were not a result of their actors' DUI arrests. The decisions were made independently, with Ana Lucia's death planned from the start and Libby's demise aimed at adding shock value. The timing of the arrests was coincidental, and the reality behind the characters' deaths is far less scandalous.