The man accused of murdering a New Cassel mom is due in court Tuesday.Police say Joanna Bird, a single mother of two, was stabbed to death last Thursday afternoon in her New Cassel home by her ex-boyfriend, Leanardo Valdez-Cruz. Her family blames the mistakes made by police and prosecutors for Bird's death.Sharon Bird, one of Bird's sisters, says the family called police on Valdez-Cruz more than half a dozen times last week, including the night before she was found dead. The family says he was harassing her. Nassau County District Attorney Kathleen Rice says Bird had an order of protection against her alleged killer.Bird's body was found outside her apartment last Thursday with multiple stab wounds.