Investigators expect to wrap up their preliminary probe into the Seaford shooting that killed an ATF agent and a robbery suspect as soon as the FBI finishes analyzing evidence from the crime scene, law enforcement sources said Tuesday.

Investigators have been re-interviewing witnesses and talking to people who dialed 911 during the New Year's Eve shooting, a source said.

The FBI is analyzing bullets recovered at the scene as part of a joint investigation involving the FBI, the Bureau of Alcohol, Tobacco, Firearms and Explosives, the Drug Enforcement Administration and Nassau police.

Officers also have interviewed retired Nassau Police Lt. Christopher Geraghty, 54, of Woodbury, the source said.

Geraghty and off-duty New York City Police Officer Joseph Arbia, 29, of Seaford, came upon ATF agent John Capano as he was struggling with robbery suspect James McGoey, two other law enforcement sources have said.

What investigators are trying determine is how Capano, 51, of Seaford, a decorated federal agent, was shot dead as he tried to foil the robbery of Charlie's Family Pharmacy in Seaford. The other law enforcement sources have said that the shot that killed Capano likely came from Geraghty's gun.

McGoey was shot as he allegedly reached for Capano's gun, the sources said.

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Police have said that McGoey, who has served two decades in prison for robberies committed to obtain prescription drugs, had been convicted of four robberies, three at pharmacies. Police said he held up the Seaford pharmacy with a pellet gun while Capano was getting a prescription for his father.

State records show that McGoey, 43, of Hampton Bays, did not get any prescriptions for painkillers or narcotics from physicians, say sources familiar with the investigation, who stressed that McGoey could have gotten painkillers under another name or on the street.

Whether McGoey had a current history of obtaining drugs illegally from physicians or by doctor-shopping before his robbery of the Seaford pharmacy was one of the first things that investigators checked, the sources said.

McGoey, who was released from prison in August, served 20 years for robbing pharmacies and other businesses, state records say. In some of the robberies he demanded drugs such as Valium, and prison records show he was disciplined several times for drug possession.

The deaths of Capano and McGoey has further intensified a recent multifaceted focus on the increasing violence caused by addicts seeking painkillers such as oxycodone; the ease in which doctor-shopping by addicts enables them to get huge quantities of pills; and the illegal sale of prescriptions for painkillers by physicians for cash, the sources said.

McGoey, a year before his release from prison, assured members of the parole board that he was done with his old life of crime.

In the summer of 2010, he apologized for robbing a Setauket pharmacy at gunpoint and told parole commissioners that he no longer smoked or used illicit drugs, including marijuana.

"I do not put any substances in my body; I have changed," McGoey said, according to a transcript of the July 13, 2010, parole hearing. " . . . I don't expect to be released; why, because I don't deserve it."

McGoey did not persuade the two-member board for early release. "There is a reasonable probability you would not live and remain at liberty without violating the law," the board said in denying parole.

He was released 13 months later and was to be on parole until July of this year.

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Capano's wake will be Wednesday and Thursday, 2 to 4 p.m. and 7 to 9 p.m. at the Charles G. Schmitt Funeral Home on Merrick Road in Seaford. The funeral will be Friday at 11 a.m. at St. William the Abbot Church in Seaford.