WHITEHALL (AP) - Authorities say the death of an elderly resident of an eastern Pennsylvania care home has been ruled a homicide, but no charges will be filed against the person believed responsible.

The Lehigh County medical examiner’s office said Wednesday that 89-year-old Frank Schwartz died in January, 40 days after the attack early Dec. 15 at Whitehall Manor. Officials said he never recovered and died of blunt force trauma and pneumonia, and his injuries were “consistent with him being struck with an object.”

District Attorney Jim Martin said in a statement that Schwartz was likely attacked by a fellow resident in the dementia care unit, but there were no witnesses and the victim had other injuries from falls before and after the attack. Martin also said it’s unlikely that the person believed responsible could have formed the requisite criminal intent due to his mental condition, and he would probably would never be deemed competent to stand trial.