george costello , 51 , and daughter emily were visiting manhattan when they were last seen on march 30 near their home in the wealthy seaside village of greenport .
their car was found in a parking garage on 42nd street in manhattan , but the pair , who often went into the city for theater and art museums , left no other trace of their whereabouts .
iona 's husband died in 2012 from a heart attack , and she is believed to have been ` under a lot of stress ' because of a legal battle that