Conditions in California’s overcrowded prisons are so bad that they violate the Eighth Amendment’s ban on cruel and unusual punishment, the Supreme Court ruled on Monday, ordering the state to reduce its prison population by more than 30,000 inmates.

Justice Anthony M.

More than a decade ago, a 14-year-old boy killed his stepbrother in a scuffle that escalated from goofing around with a blowgun to an angry threat with a bow and arrow to the fatal thrust of a hunting knife.

The boy, Quantel Lotts, had spent part of the morning playing with Pokémon cards.

WASHINGTON — The Supreme Court on Monday agreed to hear an appeal from a death row inmate who faces execution after a mailroom mix-up at one of the nation’s most prominent law firms.

Lawyers at the firm, Sullivan & Cromwell, had agreed to represent Cory R.