The mother of two young girls killed in their father's apartment in Oak Bay on Christmas Day is running a half-marathon in their honour.

Sarah Cotton says her daughters Chloe, 6, and Aubrey, 4, loved running – and that's why she'll take part in next month's BMO Vancouver half-marathon.

She's also fundraising for the May 6 event with a goal of $20,000.

The money will be distributed between the Mary Manning Centre, which counsels children affected by abuse, while the other half will go to the Chloe and Aubrey Berry Scholarship Fund at Christ Church Cathedral School, where Chloe was a Grade 1 student.

"With Scott and Trisha by my side, I will be running in the BMO Vancouver Half Marathon on May 6, 2018 as part of my healing and in honour of my girls. I know that they will be running alongside us in spirit," Cotton wrote on a GoFundMe campaign page.

A friend of Cotton's who is also running the half-marathon says with more than $16,000 already raised, community support has exceeded their expectations.

Andrew Berry, the girls' father, has been charged with second-degree murder in their deaths. He recently appeared by video in a Victoria courtroom where lawyers agreed to take the case directly to trial.

Berry has yet to enter a plea.