Lay-preacher and former social worker Alan Greaves, 68, died after he was attacked near his home in Sheffield last year.
Jonathan Bowling, 22, was jailed for a minimum of 25 years last month after he admitted murdering the devout Christian. Another 22-year-old, Ashley Foster, was found guilty of the manslaughter of Mr Greaves and jailed for nine years.
His widow, Church Army evangelist Maureen Greaves, 64, explained after the trial how she had forgiven her husband's killers.
Now Mrs Greaves had described how she was punched in the face in the street in June by a woman who tried to take her handbag.
She said it made her think of how her husband would have felt when he was being brutally assaulted.
"It was very frightening," Mrs Greaves said. "The worst thing was it made me imagine Alan being attacked and what he was feeling."
Mrs Greaves was attacked outside shops on Burncross Road, in Chapeltown, Sheffield.
She said the woman demanded cash and hit her so hard it knocked off her glasses and left her with bruises.
Her son, Peter, was with her and intervened.
South Yorkshire Police said a 24-year-old woman was arrested on suspicion of assault and attempted robbery.
A spokeswoman said: "A file regarding the woman has been passed to the Crown Prosecution Service."