The duo have run for the past 31 years .
The duo planned to make the 2013 race their last , but after they were stopped around the 25 - mile marker last year because of the bombings they are in it for one last race .
The duo have run for the past 31 years and planned to make the 2013 race their last , but after they were stopped around the 25 - mile marker last year because of the bombings they are in it for one last race .