Across the Rio Grande in El Paso — where the American consulate employee,

Lesley A. Enriquez, and her husband, Arthur H. Redelfs, lived — their families waited on Monday to receive their bodies and make funeral arrangements. F.B.I.agents interviewed relatives. The couple's 7-month-old daughter, who was in the car but was not hurt in the attack, wailed in the arms of her grieving uncle.

The tipping point in the reconsideration of Mr. Calderón's strategy occurred five weeks ago, when gunmen killed 15 people, most of them students celebrating a birthday party. After Mr. Calderón was forced to back down from his initial claim that the victims were gang members settling accounts, his government began to outline a list of social programs to help the embattled residents of this city reclaim their streets.

Mr. Calderón has visited the city twice since then, facing the fury of mothers who have lost their children. He will likely face more anger when he arrives on Tuesday.

"There are two myths that have fallen here in Juárez," said Lalas Tapia, a local teacher who will be organizing a protest on Tuesday with many families who have lost members to the drug wars.

"It's not true that the violence is just between the drug gangs," he said. "And this will not end soon. It has already been two years."

Ms. Enriquez, 35, who worked at the fortress-like American consulate here, and Mr. Redelfs were killed in broad daylight on Saturday afternoon as they drove home to El Paso after a children's birthday party.

At almost the same time, Jorge Alberto Salcido Ceniceros, the Mexican husband of another consulate employee who had also been at the party, was killed as he drove home with his two children, ages 4 and 7. They were wounded and are being treated in a hospital in Juárez.

Mr. Redelfs was an officer at the El Paso County Sheriff's Office, where he worked in the county jail. The couple, who was expecting their second child, had been married for several years, said Mr. Redelfs's brother, Reuben.

"He was a wonderful man," Reuben Redelfs said. "We just regret this senseless act of violence."

Few of the many shootings in Juárez get the attention being given to the consulate killings.

Jahaziel Orlando Gutiérrez Márquez, 26, was shot and killed early Sunday morning as he was walking home from his mother's house. He walked into a bar because he had seen a friend's car parked outside, and as he entered he was shot by gunmen who were apparently looking for someone else, said his wife, Kauri Flores, 23.

Ms. Flores, a local activist who runs a small community center, was returning from Mexico City with mothers of victims of drug violence who had gone to a rally when she got word of her husband's death.

"There's no justice in this city," she said. "It's one more murder. I feel so powerless."

Elisabeth Malkin reported from Ciudad Juárez, and Ginger Thompson from Washington.