A Washington gym shooting leaves a building manager dead and four others wounded after the alleged gunman referenced Luigi Mangione during a bitter condominium dispute months earlier. In Orlando, a three-year-old girl's chilling remarks to a babysitter help investigators link a mother to dismembered human remains discovered near an apartment trash compactor. Finally, newly released 911 audio captures a terrified niece thanking Ohio deputies for saving her from an upstairs closet following a Veterans Day murder-suicide. Sydney Silvagni reports.