Habibur Masum, 25, is wanted over a shocking daylight attack in Bradford on Saturday which saw the 27-year-old victim ambushed while pushing her five-month-old son.
Habibur Masum, who lives in Oldham and known to the victim, is still at large and members of the public have been urged not to approach him if seen but to call 999 immediately .
A supermarket owner attempted to save the victim after finding her lying face down on the pavement moments after she was fatally stabbed in Bradford city centre.