Last year the grave site of retired San Joaquin County chief of probation Otis Walker was surrounded by grass near a more than 17-year-old scarlet oak tree his family had purchased in 2007. As of Friday, the memorial site located at Cherokee Memorial Park and Funeral Home in Lodi has become a muddy construction zone with no trace of the oak tree. Otis’s wife, children, and family members said they never received notice from the funeral home about the tree being removed from the area. Instead, Otis’s wife learned that the tree, along with a plaque they paid for,…..