Police called to the residence shortly after 9 p.m. Sunday found the 57-year-old man outside.
He was taken to Temple University Hospital in critical condition. Inside, they found a 47-year-old man dead in the bathroom with a stab wound to the chest.
Police said they were told that the older man was in his bed when the younger man entered and assaulted him with a metal bookend and then with several knives.
He said he was able to get a knife away and struck the younger man in the chest before fleeing.
No arrests have been made and the homicide unit is investigating.
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