EVANSTON, Ill. (CBS) -- Margaret Miller Johnson, one of the four people shot and killed on a Chicago Transit Authority Blue Line train this week, is remembered for her sweet demeanor and beautiful smile.

U.S. postal worker Mechellea Williams, 28, was found shot and killed in her car near 17000 Pond Willow Drive in Orland Park.

A Southwest Side man has been charged with murder in connection with an April shooting that killed 9-year-old Ariana Molina and wounded 10 of her relatives, authorities said. Octaviano Romero, 39 and a resident of the New City neighborhood,

A man has been charged with four counts of first degree murder after four people were fatally shot on a Chicago Transit Authority train in Forest Park, Illinois, early Monday, officials said.