One person died outside in the brutally cold weather over the weekend — bringing the tally of dead to 18 during the historic cold snap, officials said Monday. The person was found on the street Saturday morning just after 9 in The Bronx at East Gun Hill Road and Seymour Avenue, City Hall officials said. Neither person’s age, name, nor sex was released. The death is the latest during the weekslong stretch of frigid weather that saw temperatures plummet to below negative 15 degrees with wind chill this past weekend.