Amid a historic drop in violent crime, homicides have fallen to lows not seen in decades. But in what researchers say is an alarming trend, homicides related to domestic violence are on the rise.

There were 37 such killings in Philadelphia last year, up from 28 the previous year. And even as homicides have fallen sharply overall, domestic killings remain stubbornly intractable. In all, deaths related to domestic violence accounted for about one in six homicides in the city last year, records show.

To address that, the police department is adding specialized training for officers and others who deal with victims of such crimes and adding staff in its Office of Community Advocacy and Engagement. When the unit expands this spring, staffers will be trained to spot signs of domestic abuse and advocate for victims of intimate partner violence, among other crimes.

That work mirrors efforts in cities such as New York, which launched a new police unit last year dedicated to combating the surge in domestic violence as such crimes rise nationwide.

“The numbers are moving in the wrong direction,” said Marian Braccia, a professor at Temple University’s Beasley School of Law and a former prosecutor in the district attorney’s family violence and sexual assault unit. “It’s terrifying.”

In Philadelphia last year, the slaying of Kada Scott drew attention to the issue after The Inquirer reported that her accused killer, Keon King, had previously been accused of stalking and kidnapping another woman. But two criminal cases against him fell apart when the victim failed to appear in court and prosecutors withdrew the charges.

Scott’s killing led City Council to examine prosecutors’ handling of King’s earlier cases, and the district attorney’s office later said it had been a mistake to withdraw charges and filed a new criminal case.

And last month, calls for awareness surrounding domestic violence were renewed when Yuan Yuan Lu, 28, was killed one day after reporting that her ex-boyfriend had sexually assaulted her in his Pennsport home. Police say 32-year-old Yujun Ren followed Lu to her Levittown home and shot her in the head, killing her.

According to prosecutors, Lu told police the day before she was killed that Ren carried a gun and she feared for her safety.

Philadelphia’s new unit would work to support victims in just such circumstances, officials said. The office launched last spring with 10 victim advocates with backgrounds in social work and behavioral health.

In March, those staffers will begin working with victims of sexual assault and domestic violence, said Ayanna Greene-Davis, executive director of the Office of Community Advocacy and Engagement.

And the unit will add 10 more members — sworn police officers with law enforcement experience — who will complete similar victim-oriented training, she said.

“We’re not going to take days and days and days” to respond to reports of domestic violence, Greene-Davis said. “In the past, that happened.”

Victims of such crimes will be able to call the office’s advocates to voice concerns about their cases as they are investigated, according to Greene-Davis. And advocates will be trained to connect them with resources such as domestic abuse shelters and provide information on ways to remove themselves from dangerous living situations.

The unit will also oversee a broader effort to train patrol officers throughout the department to better assess the dangers victims of domestic violence face and work to keep them safe.

“Every victim is going to be in a different stage, but we can talk to them,” Greene-Davis said. “We can provide a safety plan.”