A man was stabbed to death and a woman was injured Thursday at a San Gabriel Valley residence, authorities said.

About 5:25 p.m., Baldwin Park police responded to a residence in the 4700 block of Maine Avenue, according to the Los Angeles County Sheriff’s Department.

The 23-year-old man died at the scene, and the woman was hospitalized with moderate stab wounds, L.A. County Fire Department Capt. Matt Boyan told the San Gabriel Valley Tribune.

Homicide detectives from the Sheriff’s Department are investigating the incident.

In the last 12 months, there has been one slaying in Baldwin Park, according to The Times’ Homicide Report database. Five people have died of stab wounds in the city since 2000.

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A Pico Rivera nightclub owner was arrested this week after federal officials say he laundered hundreds of thousands of dollars as part of a drug-trafficking ring operating in the United States and Mexico, according to court documents released Thursday.

Following an investigation lasting more than three years, Edgar Fragoso was arrested Monday when the Drug Enforcement Administration raided his nightclub, El Rodeo, and his Hacienda Heights home, said Special Agent Vijay Rathi. The Pico Rivera home of Fragoso’s mother -- whose name is listed on some of his bank accounts -- was also raided.

Fragoso has been charged with one count of money laundering. If convicted, he faces up to 20 years in federal prison.

The apparent takedown of Fragoso and his nightclub -- an establishment that's been marred by violence for years -- is regarded as a major victory in the battle against the regional and cross-border drug trade.

"Dismantling operations like the one operating in the El Rodeo Night Club...

The sign hanging around Luis Blazer's neck listed the reason he was standing outside with thousands of teachers Thursday evening, calling on the country's second-largest school district to accept the demands of United Teachers Los Angeles.

Blazer has 45 students in his ninth-grade algebra class at Rancho Dominguez Preparatory School, a number he said is too high for him to effectively do his job.

"Class size is the main reason I'm here," Blazer said. "If you have 54 minutes of class time and you have 45 students that means each student is getting less than two minutes of attention. No matter how good of a teacher you are, you're always going to lose the group."

Blazer, like many other educators who filled Grand Park in downtown Los Angeles, said that he is not financially prepared to strike but that he would if the Los Angeles Unified School District does not reach an agreement with the teachers union to reduce class sizes, raise teacher pay and develop a new system for evaluating...

Nearly four decades may separate Marvin Gaye’s “Got to Give It Up” and Robin Thicke’s “Blurred Lines,” but many of its musical elements hew too close for comfort, a musicologist testified Thursday in a federal copyright infringement trial.

Judith Finell was called to the stand by the children of Marvin Gaye, who are suing Thicke, singer and producer Pharrell Williams and rapper T.I., alleging that their 2013 summer hit “Blurred Lines” infringes on Gaye’s 1977 song.

Finell dissected the songs, demonstrating to jurors what she said were eight similarities between the two works.

“It’s the same notes, the same rhythm, it’s just … the same,” she said, comparing a line from the two songs.

Finell said the hook, bass line and a melodic theme repeated throughout the songs were very similar. So were parts of the lyrics, she told jurors, including lines that the family’s attorney, Richard Busch, deemed too vulgar to read out loud in court. Both songs break into a spoken interlude — T.I.’s rap for...

A judge declared a mistrial Thursday in the case of an LAPD officer accused of kicking a woman in the groin during an arrest in 2012 that ended in the woman’s death.

Mary O’Callaghan’s trial took an unexpected twist Thursday after an official in the Los Angeles Police Department's internal affairs division gave a prosecutor new information about a sergeant who witnessed the 2012 incident, said Robert Rico, O’Callaghan’s attorney.

Rico said the internal affairs employee approached Assistant Head Deputy Dist. Atty. Shannon Presby on Thursday morning and told him about a disciplinary hearing in which the sergeant testified that he advised O'Callaghan to stop during the 2012 altercation with Alesia Thomas.

The sergeant didn’t mention ordering O’Callaghan to stop in earlier statements to internal affairs investigators, Rico said.

The defense attorney questioned why it took so long for the LAPD to come forward with the information, saying he believed department officials must have known...

Water officials in Kern County discovered that oil producers have been dumping chemical-laden wastewater into hundreds of unlined pits that are operating without proper permits.

Inspections completed this week by the Central Valley Regional Water Quality Control Board revealed the existence of more than 300 previously unidentified waste sites. The water board’s review found that more than one-third of the region’s active disposal pits are operating without permission.

The pits raise new water quality concerns in a region where agricultural fields sit side by side with oil fields and where California’s ongoing drought has made protecting groundwater supplies paramount.

Clay Rodgers, assistant executive officer of the water board’s Fresno office, called the unregulated pits a “significant problem” and said the agency expects to issue as many as 200 enforcement orders.

State regulators face federal scrutiny for what critics say has been decades of lax oversight of the oil and gas industry and...