PONTIAC, Mich. — Calling her mother a "monster," Jennifer Hoffman said the 75-year-old woman deserves to be in prison for fatally shooting her teen son and strongly refuted the image painted of the boy during the Detroit-area grandmother's trial.Sandra Layne, of West Bloomfield Township, was found guilty Tuesday of second-degree murder in death of her 17-year-old grandson Jonathan Hoffman last May 18.