We may never know exactly how many times Melissa Ann Shephard (inset) has killed. In a criminal career that spans five decades, Shephard has sown confusion, obfuscated with layers of lies and masqueraded as a victim. The criminal justice system, unable to affix the damning labels she may deserve – serial killer, psychopath – continues to turn her loose to kill again and struggles to contain her. She has learned from her criminal mistakes and profited from her predation. Infamous as the ‘Internet Black Widow,’ Shephard was released Friday (March 18, 2016) from a women’s prison in Nova Scotia – amid a police warning – after her latest stint behind bars, a three-and-a-half year sentence. It was imposed in 2013 after she admitting spiking drinks of her newlywed fifth husband, 74-year-old Fred Weeks, with potent tranquilizers. An attempted murder charge was dropped when Shephard pleaded guilty to lesser charges. Two of Shephard’s four husbands who preceded Weeks ended up dead and another mysteriously fell ill immediately after meeting Shephard. Recent prison assessments (read what experts say, in internal documents after the jump) warn that Shephard scores high for some psychopathic traits, she is resistant to treatment and indifferent to the suffering of her victims. The only thing that has contained her lethal greed in the past 40+ years has been time behind bars and yet, the system has refused to apply the brand that could keep her locked up.