Mr Masum also denied two counts of assault by beating, one charge of making threats to kill and one charge of stalking, all against Ms Akter.
He also pleaded not guilty to possession of a bladed article.
Ms Akter was attacked at about 15:20 BST as she pushed her baby in Bradford city centre.
Emergency services were called, but Ms Akter was pronounced dead at the scene a short time later.
The court heard the allegations of assault and threats to kill related to two days last November.
Mr Masum is accused of stalking Ms Akter between November and April, with the charge alleging he “tracked her movements and located her at a safe house, sent her messages of a menacing nature which contained threats to kill another and photos and videos of the area and premises where she was residing”.
He is also alleged to have “loitered in the area of her temporary residence”.
The charge alleges he caused her “alarm or distress” and to “fear that violence would be used against her”.
