A Baltimore detective was fatally shot with his own gun just one day before he was set to testify before a federal grand jury in a case involving other officers, the city’s police commissioner said Wednesday.

“Detective Suiter was going to offer federal grand jury testimony about an incident that occurred several years ago that included officers who are now federally indicted back in March,” Police Commissioner Kevin Davis said of Sean Suiter.

“He was scheduled to offer grand jury testimony the day after he was murdered,” he added.

But Davis stressed that as the search for Suiter’s killer continues, there was currently no evidence that the slaying was linked to his upcoming testimony or any conspiracy.

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19 PHOTOS c See Gallery c U.S. Congress - Abscam. October 14, 1980. (Photo by Dan Brinzac/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images) Mugshot of American gangster Al Capone (1899 - 1947) smiling in a jacket and tie, Miami, Florida. (Photo by Hulton Archive/Getty Images) A corporate mailroom employee uses gloves while sifting through letters October 15, 2001 in New York City. The FBI reported a letter containing anthrax was sent to US Senate Majority Leader Tom Daschle. (Photo by Mario Tama/Getty Images) Fedreal Burau of Investigation (FBI) officers inspect the collapsed World Trade Center complex 16 September 2001 in New York. Investigation, clearing, and rescue work continues on the site of the 11 September nation's worst terrorist attack. 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Kilgore, alleged to have belonged to a guerrilla gang that kidnapped U.S. newspaper heiress Patty Hearst in 1974, is not expected to face charges for any offence punishable with the death penalty, spokesman Brian Penn told Reuters. REUTERS/Mike Hutchings Head shot of aspiring actress Elizabeth Short, a murder victim nicknamed the Black Dahlia FILE PHOTO APR96 - Theodore Kaczynski , accused of being the Unabomber, is shown in his booking mugshot from April 1996. Kaczynski pleaded guilty to charges he waged a deadly 17-year campaign of terror under a court agreement that will spare him from the death penalty, U.S. Justice Department officials said January 22. UNABOMBER (Original Caption) President Richard Nixon, claiming he was misled by his staff, has assumes 'full responsibility' for the Watergate bugging and indicated a special prosecutor may be named to investigate the worst crisis of his presidency. Six top administration officials have resigned as a consequence of the case. 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“While I understand the wild possibilities that go through people’s minds when we all want answers, I just am determined to keep following the evidence,” he said. “There’s nothing we won’t consider, there’s no path we won’t go down if the evidence takes us down that path."

But Davis said the evidence appeared to show that the murder followed a “spontaneous encounter” after Suiter approached a man behaving suspiciously in a vacant lot in between some houses on Nov. 15. He died the following day.

Davis said evidence showed that Suiter’s decision to approach the man was “spontaneous and unplanned” and it was not as if the officer had been lured to any particular location.

The commissioner added that the evidence refutes that Suiter’s partner “was anything but just that — his partner.”

That officer took cover across the street upon hearing the sound of gunfire and then immediately called 911, he said.

There was evidence of a physical struggle between Suiter, 43, and his killer and the detective was shot in the head and killed by his own gun, Davis said.

Suiter was an 18-year-veteran of the force and father of five.

He was due to testify before a federal grand jury investigating a group of Baltimore officers who worked together on a firearms crime task force and have been charged with stealing money, property and narcotics from people over two years, according to The Associated Press.

Related: Seven Baltimore Cops Indicted on Federal Racketeering Charges

The members of the Gun Trace Task Force, a small unit tasked with removing illegal guns from Baltimore streets, were described in an indictment as abusing their position to detain people under false pretenses, threaten them and steal from them, according to the AP.

They are also stand accused of faking police reports, lying to investigators and defrauding the department.

Davis emphasized that he had been told both the acting attorney general and the FBI Special Agent in Charge of the Baltimore field office that Suiter was a witness, and “not the target of any ongoing criminal investigation.”

“There is no information that has been communicated to me that Detective Suiter was anything other than a stellar detective, great friend, loving husband and dedicated father,” he said.

A reward of $215,000 is being offered for information leading to the arrest of the person who killed Suiter.

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