Education
Like his brother Tim, he also attended Christian Community High School and served as Vice Captain in his last year of high school during 2007.
Like his brother Tim, he also attended Christian Community High School and served as Vice Captain in his last year of high school during 2007.
His position was at property He was the brother of Tim Mannah, who also plays for the Parramatta Eels. Jon and Tim both played for the Parramatta Eels through the junior ranks before Jon joined the Cronulla Sharks just prior to the commencement of the 2009 NRL season from Parramatta.
In 2011, he scored his first try in first grade for Cronulla in Round 3 against the Panthers.
Mannah qualified for Lebanon through heritage and was named in the Lebanon squad for the 2013 Rugby League World Cup qualifying tournament. Mannah was first diagnosed in 2009 with Hodgkin"s lymphoma.
He died of the disease on 18 January 2013 at age 23. His funeral was held at Faith Baptist Church Sydney in Regents Park on 21 January 2013.