It was the middle of winter 2009, and the elderly pair, taking pity on a homeless man, let him move into their Hunting Park home.
In return, he agreed to help around their house, on the 3900 block of North Percy Street.
By two years later, police said, things had soured and the house guest, William Miller, began to beat his benefactors, a brother and sister.
Police said Miller, now 55, would regularly beat the 83-year-old woman and the 85-year-old man. The male victim, they said without providing details, has medical conditions and was beaten every day.