Simon Cox bagged a brace to fire Southend United to a 3-1 League One win against Charlton Athletic at Roots Hall.The Shrimpers striker scored in each half as Phil Brown's side ended a run of four successive defeats in all competitions.Cox's first goal came after just two minutes when he netted with a neatly-controlled left-footed shot from close range.And Southend doubled their lead in the 11th minute when experienced centre-back Michael Turner bagged his first Shrimpers goal, heading a right-wing free-kick from Anthony Wordsworth into the bottom left-hand corner.A shell-shocked Charlton improved after the break and got back into the game in the 66th minute when ex-Southend loanee Ben Reeves sent a low, left-footed shot into the bottom corner from 12 yards.But Southend hit back and made sure of a welcome win when Cox netted with a powerfully struck-low volley from 10 yards.