ATHLETICS NEWS - Massey raced in the 4x400m heats at the Rio 2016 Games and therefore received a medal after her team-mates went on to finish third in the final in Brazil.
She also won 4x400m silver at the 2010 Commonwealth Games in Delhi when competing for England.
"My birthday present to myself is to hang up the spikes, sit back and enjoy everything I have achieved," she said.
Massey's other honours include European Championships gold in 2016 and bronze in 2014 as well as Commonwealth bronze in 2014, all in the 4x400m.
