NEW : Mexican police say they are dead . `` For 40 years she has gone around Mexico , trying to be there as a nurse , a friend , as a spiritual adviser and has loved them . Nancy Davis was killed by gunmen in a black car , police say . They lived in Mexico since 1970s ; they worked with Gospel Proclaimers mission . ` ` They love Jesus . That 's their love , '' friend said of the couple .
NEW : Mexican police say they are dead . Nancy Davis was killed by gunmen in a black car , police say . They lived in Mexico since 1970s ; they worked with Gospel Proclaimers mission . ` ` They love Jesus . That 's their love , '' friend said of the couple .