* The murder trial of Autumn Hills Convalescent Centers Inc., a nursing-home chain, and four persons ended in a mistrial in San Antonio, and prosecutors said they would move to dismiss charges that an elderly patient died from neglect.

* U.S. prosecutors in Miami asked that Surinamese Army Capt. Etienne Boerenveen and two others be held without bail on charges of offering their South American country as a haven for cocaine smugglers heading for the United States.

* Radioactive gas built up in the containment building of Three Mile Island's undamaged nuclear reactor during tests, stopping work for 12 hours. About 100 employes were checked for radiation exposure as a precaution.

* Soviet dissident Yelena Bonner left Boston for a Caribbean vacation after breaking a silence imposed by Soviet authorities and criticizing them for secretly making videotapes of her husband, physicist Andrei Sakharov.

* President Reagan and Minnesota Gov. Rudy Perpich (D) have signed legislation providing property and money to Chippewa Indians for land illegally taken from them nearly 80 years ago and to clear up titles for present land owners.

* A piece of solid rocket fuel exploded, killing one person, as workers at an Edison, N.J., test site attached a blasting cap.