Lyle, left, and Erik Galen Menendez sit in Beverly Hills, Calif., courtroom, May 14, 1990 as a judge postponed their preliminary hearing on charges of murdering their parents last August.

Lyle, left, and Erik Galen Menendez sit in Beverly Hills, Calif., courtroom, May 14, 1990 as a judge postponed their preliminary hearing on charges of murdering their parents last August.

FILE – Lyle, left, and Erik Galen Menendez sit in Beverly Hills, Calif., courtroom, May 14, 1990 as a judge postponed their preliminary hearing on charges of murdering their parents last August.

Lyle, left, and Erik Galen Menendez sit in Beverly Hills, Calif., courtroom, May 14, 1990 as a judge postponed their preliminary hearing on charges of murdering their parents last August.

Convicted killer Erik Menendez was checked into the hospital last week. His attorney, Mark Geragos, told NBC News on Tuesday that he was diagnosed with a “serious medical condition.” Geragos’ ...