San Francisco police say an 82-year-old woman was stabbed to death and that a relative has been arrested.
Relatives of Chii-Chyu Horng tell the San Francisco Chronicle her 30-year-old grandson, Andrew Luke, was detained and hospitalized after Horng's body was found Wednesday.
The suspect's ex-stepmother, Eva Fok, says that Horng raised Luke after his mother died when he was a child and the two lived together in San Francisco's South of Market.
Fok says she doesn't know what happened and but that Luke loved his grandma. She adds that Luke suffered from mental illness and was prone to violence.
San Francisco police found Horn's body while responding to a request for a welfare check. They decline to provide additional details because of the ongoing investigation.