Erin Patterson, convicted of murdering three family members, was also suspected of attempting to poison her estranged husband on several occasions prior to the fatal incident.
Sheffield teen found guilty of premeditated school stabbing murder, prompting scrutiny of prior warnings and school's failure to prevent tragedy.
Erin Patterson, convicted of murdering three family members, was also suspected of attempting to poison her estranged husband on several occasions prior to the fatal incident.
Sheffield teen found guilty of premeditated school stabbing murder, prompting scrutiny of prior warnings and school's failure to prevent tragedy.