Erik Menendez, 54, is in the hospital and has been diagnosed with a serious medical condition, his family confirmed to ABC News.

Menendez, who is in a San Diego prison, was taken to an outside medical facility Friday and remains in fair condition, an official said.

Erik Menendez has been hospitalized, and his attorney wants him released from prison ahead of an upcoming parole hearing.

California Gov. Gavin Newsom reveals he avoided Netflix's Menendez series to maintain impartiality as he prepares to make a critical parole decision by Labor Day following resentencing.

Erik Menendez remains in fair condition Tuesday after he was transported to a medical facility about a month before a scheduled parole hearing.

Erik Menendez and his brother, Lyle, have spent more than 35 years prison for killings their parents in 1989 in a case that over the past year has gained renewed public attention following the release of Netflix's "Monsters: The Lyle and Erik Menendez Story" and various documentaries.

His attorney on Tuesday said Menendez has been treated outside of prison, the Richard J. Donovan Correctional Facility in Otay Mesa, since Friday.

Erik Menendez’s lawyer is pleading with California Gov. Gavin Newsom to release him immediately after the convicted-killer-turned-Netflix-star was hit with a serious medical condition. Menendez’s health issue is apparently so serious that his lawyer wants him freed ahead of next month’s parole hearing,

Lyle Menendez called actor Cooper Koch from prison to congratulate him on his Emmy nomination for portraying Erik Menendez in Netflix's "Monsters" series, a report says.