John Joyce and wife , Sheridan , found dead in New Jersey home last year . They had both been stabbed several times , while their house was ablaze . On Friday , prosecutors ruled Mr Joyce , 72 , stabbed to death wife , 69. Cooper Health System CEO 'then set fire to house and stabbed himself ' Couple 's children have released statement challenging official findings . Four sons say they still do n't know who killed parents on September 28 . But prosecutors said inquiry found no signs of break-in at the property . Also said Mr Joyce was 'withdrawn ' and 'very upset ' prior to deaths .
John Sheridan and wife , Joyce , found dead in New Jersey home last year . They had both been stabbed several times , while their house was ablaze . On Friday , prosecutors ruled Mr Sheridan , 72 , stabbed to death wife , 69. Cooper Health System CEO 'then set fire to house and stabbed himself ' Couple 's children have released statement challenging official findings . Four sons say they still do n't know who killed parents on September 28 . But prosecutors said inquiry found no signs of break-in at the property . Also said Mr Sheridan was 'withdrawn ' and 'very upset ' prior to deaths .