Police were awaiting positive identification, the sources said.
Foster, a Southeast Washington resident, was Brown’s longtime boyfriend and the father of her 23-month-old daughter. But her family thought that he was abusive, and they had begged her to break up with him, to little avail.
Not even Brown’s stepfather, a longtime D.C. police officer, could persuade her.
But in February, Brown filed a petition in court seeking sole custody of her child. Family members said that signaled a breakup, which they think led to the shooting that killed Brown and injured her child.
“Selina was a very humble young girl,” said Naomi Ferguson, 70, the mother of Brown’s stepfather, Derrick Ferguson. “She was just taken off her feet by this young man.”
“What happened is so sad,” said Naomi Ferguson, who lives in the Bronx. She said her son, who joined the police force 16 years ago, “was very frustrated” at his inability to help his stepdaughter safely escape the relationship.
As D.C. police announced the arrest warrant for Brown on Monday afternoon and publicized Foster’s picture, Brown’s loved ones mourned their loss and worried about the young survivor: A wound that police initially called a graze is more serious, according to authorities and family members.
D.C. police Cmdr. George Kucik, head of the criminal investigation division, called the shooting a “horrific crime” but declined to describe the toddler’s wounds. Naomi Ferguson said that a bullet went through the crown of the child’s nose and that she will need reconstructive surgery.
The girl’s injuries did not appear to be life-threatening, police said.
The shooting occurred about 5:40 p.m. Sunday at a B2 Metrobus stop at 18th Street and Minnesota Avenue SE. Naomi Ferguson said that Brown, who lived in Northeast Washington, had been visiting a friend and was waiting for the bus home.
Police said Brown was holding her child in her arms and boarding the bus, possibly with one foot on the first step, when she was shot several times in the face. A woman who lives near the scene told The Washington Post that a man and woman had argued before the shooting; police did not provide details about that part of the incident.
Brown, holding her daughter, fell into the bus as the driver quickly drove about a block down Minnesota Avenue with her aboard, police said. On Monday, police praised the driver for getting his passengers to safety.
“It was heroic,” Deputy Metro Transit Police Chief Leslie Campbell said at a news conference Monday at police headquarters. “He got the bus out of harm’s way.”
Caroline Lukas, a Metro spokeswoman, said the driver suffered a contusion on his leg, but she could not confirm its source. It was unclear whether he had been shot. The window behind him had been broken by a bullet, according to a Metro union official.
There were passengers on the bus and waiting at the stop, but authorities were unable to say how many. On Monday, only wet leaves and long strands of yellow police tape marked the scene. B2 buses continued to make stops as usual, even as police checked the area with metal detectors.
Kucik said detectives are reviewing video surveillance tape from the bus that might show the shooting.
As part of the effort to find the suspect, a law enforcement official said, officers searched a house near East Capitol Street. A man who shouted through the door said he had no comment about Foster.
When police first made public the identity of their suspect, Kucik described Foster as “armed and dangerous.” Police announced a reward up to $25,000 for information leading to his capture and conviction.
Details of Foster’s apparent trip to New York were not immediately available.
Naomi Ferguson said she thinks Brown’s breakup with Foster led to the deadly attack, although she said she doesn’t know what happened in recent days. But the family was well aware of Foster’s past: He was was sentenced to 18 months in jail in 2011 for violating the terms of his probation after a 2007 conviction for possession and selling PCP, according to D.C. Superior Court records. In 2010, court documents show that Foster was sentenced to 30 days in jail for an assault stemming from a charge that he bit his then-girlfriend, pulled her hair, choked her, punched her and dragged her down the stairs after she received text messages from another man.
Naomi Ferguson said family members pleaded with Brown, a home health aide who wanted to join the military, to leave Foster. In the court petition filed in February, she alleged child neglect against him and added that joint custody would not be in the best interest of the child.
She asked the court to work out a visitation schedule for Foster and his daughter but did not seek child support. Naomi Ferguson described her son as devastated by what happened. “Selina was taken out at the prime of her life,” she said. “My heart is full of sorrow.”
Dana Hedgpeth, Jennifer Jenkins and Martin Weil contributed to this report.