After she died, her profile page remained live. It still contains nine pictures of her with Maslin, 23.
“We would like to continue to remember the good times we had with her but are left traumatised when you see her with him,” he said.
“Their [Facebook’s] policy is wrong but I am not hopeful they will change their minds.”
A Facebook spokesperson told the broadcaster: “We memorialise accounts to provide a place of remembrance and maintain the profile as it was when the person passed away.
“We understand in tragic cases such as this it may mean there are sometimes painful reminders but memorialised accounts are designed to preserve the privacy of the deceased.”
Staff and customers tried to protect her, but he stabbed her 14 times in front of them and was sentenced to life in prison for the attack.
Maslin’s mother said she begged police to arrest her son the day before he killed his ex-girlfriend, telling the BBC she said they had to arrest her son “before it got out of hand”.
The Independent Police Complaints Commission said it had identified “areas of learning”.