Garforth Academy teacher Rachel Shakespeare, 34, shared an office with fellow teacher Ian Winterburn, 58, who died on December 22 2016 after being involved in collision with a car while cycling on the A6120 ring road at Halton, Leeds.
Miss Shakespeare’s friend Steph Turner, 28, died in a collision in London while cycling to work in January 2015.
Miss Shakespeare, 34, said: “Ian was a great person and used to really encourage me with my running – always urging me to go that extra mile and telling me I could do it.
“He encouraged me to take part in the Leeds Half Marathon back in 2014 and I swore I’d never run it again. But it seemed fitting to get back out there and remember Ian.
“Ian’s family are really happy that I ran in his memory. They came to watch me at the seven-mile mark and I started crying a little bit because it was really nice to hear them supporting me.”
Miss Shakespeare said she Steph Turner were friends from Middlesbrough University, adding: “Steph’s life was really just beginning; she’d got engaged and had a job she loved. And then suddenly she was gone.”
Miss Shakespeare has so far raised £600 for road safety charity Brake. To donate, go to www.justgiving.com/fundraising/Rachel-Shakespeare