Describing her family's pain as "unbearable," the sister of slain Chicago police Officer Luis Huesca is pleading with the public to help investigators identify and catch a suspect who allegedly gunned him down and stole his gun and car as he arrived home from work. Huesca's sister, Lily O'Brien, said she had asked her 30-year-old bother to move across the country to be close to his nieces and nephews, but said he decided to stay in Chicago and protect his community. "He chose to stay here, which is why I feel like the community needs to show up for him the same way because he paid with his life to stay here," O'Brien told Chicago ABC station WLS this week.