The schoolgirl was shot dead at her home in Dovicott, Liverpool, on the evening of August 22 after a gunman chased another man to her home in Dovicott, Liverpool, shocking the nation.
Merseyside Police use derby match to urge anyone with information about murders to come forward
Olivia’s image appeared on the big screen at Goodison Park with the words “In Loving Memories” and fans commemorated her with a minute of applause in the ninth minute of the match.
In another attempt, the force’s Twitter account retweeted video footage of a male detective trying to track down people in the area at the time of the attack.
He was pictured standing on Finch Lane, near the junction of Kinches Avenue, Liverpool.
Today’s tweet read: “We need to know who this man is as Olivia Pratt-Korber, 9, was in the area when he was shot dead at his Liverpool home on August 22.
“Do you know his name? Have you seen it? We believe he may have important information that could help us catch the killer.
Detective Chief Superintendent Mark Cumming said: ‘I am interested in speaking to him as he may have important information for the investigation.
“So I’m calling on the man to come forward and let the investigation team know.
“If anyone knows who this person is, please let us know.”
Earlier this week Mr Kameen posted photos of the man who police say murdered the schoolgirl and revealed the killer had brought two guns but had not been located .