A woman places flowers by an ATM machine outside a bank Friday in Philadelphia. A man was expected to be charged in the death of two armored car guards at the bank ATM Thursday.

PHILADELPHIA — A man brought in for questioning was expected to be charged overnight in connection with the robbery and slaying of two armored car guards, police said late Friday.

"It's over. We're done," said a detective who declined to give his name.

The suspect had been arrested in northeast Philadelphia on a warrant in another case but was questioned about the shooting, which occurred Thursday while the guards were servicing an ATM, police said.

The Philadelphia Inquirer, citing police sources, reported the suspect was a 36-year-old city resident with a history of bank robberies. He was not identified because he had not yet been charged.

"If he is the suspect that killed my husband, he hurt his own family too," said Donna Alullo, the widow of slain guard Joseph Alullo. "We hope that it is the suspect ... so that he is off the street and doesn't do it to anyone else."

Authorities had spent Friday fielding tips about the suspect, described as a black man with a beard in his early to mid-20s, and his getaway car, a new, dark-colored Acura TL Type-S. Police towed a car matching that description from the apartment complex where they made the arrest Friday afternoon.

The robber approached the armored car from behind Thursday morning outside a bank in northeast Philadelphia. He shot one guard in the chest, then went around the vehicle and shot the second guard as he tried to unholster his gun, police said. He shot toward a third guard inside the armored car, picked up a bag of deposits and fled.

Investigators on Friday still had not determined how much money the robber escaped with, but they believe he may have grabbed deposits — likely a mix of checks and cash.

As authorities searched for the robber, officials with the company that employed the guards, Loomis, were in the Philadelphia area meeting with employees and the guards' families. The company has about 190 total employees in the Philadelphia area, about half of them guards.

Neither of the slain guards was wearing a bulletproof vest.