Career
A full-forward, Blethyn had a slim frame and wore glasses on the field He kicked four goals in Essendon"s 1968 Grand Final loss to Carlton and had his most prolific game up forward when he kicked 11 goals against Footscray during the 1972 VFL season. lieutenant had been a record breaking year for Blethyn, he finished it with 107 goals and he had been the first Essendon player since John Coleman in 1950 to kick over 100 in a season.
He however missed out on the to Collingwood"s Peter McKenna who kicked 130 goals for the season.
The following season Blethyn left for WAFL club Claremont but returned to Essendon in 1976 where he topped their goalkicking with 39 goals. lieutenant was the third time Blethyn had finished a season as Essendon"s top goalkicker, having done so in 1970 and 1972.
Blethyn left Essendon for good in 1977 when he transferred to SANFL club Portuguese Adelaide and that season played in the only premiership side of his career. Blethyn currently lives in Adelaide and works as a property advisor.