The brothers were initially sentenced to life without the possibility of parole.
Erik and Lyle Menendez's fight for freedom will continue this week when the brothers face a parole board, separately.
The L.A. County DA's office filed a 132-page response opposing the Menendez brothers' bid for a new trial.
Erik Menendez is out of the hospital and back in prison. The Department of Corrections and Rehabilitation says the 54-year-old was hospitalized last month with kidney stones.
Erik Menendez, 54, is in the hospital and has been diagnosed with a serious medical condition, his family confirmed to ABC News.
New questions are being raised in the Menendez brothers' fight to be released from prison.