Authorities in Florida have released chilling footage of a missing woman swimming and wading in an alligator-infested river before she vanished. Paola Miranda-Rosa, 31, who authorities say is schizophrenic, was reported missing by her family three weeks ago after she was last seen at a relative’s Orlando apartment. The Osceola County Sheriff’s Office revealed this week that hikers had since come forward to say they spotted the missing woman in Wekiva Springs State Park on Dec. 18 — a day after her family last saw her. The hikers gave investigators a video they took of the woman swimming solo in...