McHenry County Sheriff’s Deputy Jacob Keltner (left) and Floyd E. Brown, 42, of Springfield (right). | Provided Photos

An FBI agent testified at the trial of Floyd Brown and said the defendant watched police ambush videos before he allegedly shot and killed McHenry County Sheriff’s Deputy Jacob Keltner.

A federal trial began on March 28 for Floyd E. Brown, 42, of Springfield, who is facing a slew of charges for shooting Keltner, 35.

Special Agent Jeremy Smith testified to a jury Thursday that he examined the history on a laptop believed to belong to Brown and found multiple web searches beginning on January 5, 2019, the Rockford Register Star reported.

One search was “cop get ambushed,” which showed links to videos and news articles about officers being shot.

Another search on the laptop was “U.S. Marshal shot,” which showed a video titled, “Moments after a U.S. Marshal was shot and killed while serving felony warrant,” Smith testified.

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A third search performed on Bing on the laptop was, “Can a bulletproof vest stop a 223 round.”

Smith also testified that there were similar searches also found on a Samsung phone.

The Rockford Register Star also reported that prosecutors played a series of videos in court found on the Samsung phone.

“I’ve got so much hatred for these motherf—–s,” Brown said in one of the videos. In a second clip, he said he would make the police “famous.”

Keltner, who was a sheriff’s deputy in McHenry County, also worked as a Special Deputy for the U.S. Marshal Service Great Lakes Regional Fugitive Task Force.

McHenry County Sheriff Bill Prim talks with sheriff’s deputies outside of the Extended Stay Hotel, 747 North Bell School Road in Rockford, after a McHenry County Sheriff’s deputy was fatally shot on March 7, 2019. | Photo: Alex Vucha / Lake and McHenry County Scanner

The task force on March 7, 2019, was attempting to serve an arrest warrant on Brown, who was staying at the Extended Stay America Hotel in Rockford.

When police knocked on the hotel room door where Brown was staying, he opened fire on the officers with a high-powered rifle, officials said.

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Brown’s girlfriend, who was in the hotel room with him, was shot when Brown opened fire, police said.

Police said Brown jumped out of his hotel room window and then opened fire again on officers, striking Keltner.

Keltner was later pronounced dead at a hospital. The woman sustained non-life-threatening injuries.

Brown fled the scene in a vehicle and led Illinois State Police and other agencies on a 150-mile pursuit.

Pursuit speed reached over 100 mph until Brown’s vehicle came to a stop on Interstate 55 near Lincoln, Illinois when he ran over spike strips.

A United States flag is draped over the casket of McHenry County Sheriff’s Deputy Jacob Keltner outside of Woodstock North High School on March 13, 2019. | Photo: Rich Chapman

Brown was indicted by a federal grand jury on charges of first-degree murder, attempted murder of a government officer, two counts of assaulting or impeding a federal officer, unlawful transport of firearms, possession of defaced firearms, firearm possession in furtherance of violent crime where death occurs and firearm possession in furtherance of violent crime.

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A grand jury indictment alleged that Brown used a Romarm WASR-10 rifle to shoot and kill Keltner.

Police also recovered two 9mm pistols and a .223 caliber rifle in Brown’s possession.

All four guns had their serial numbers removed, the indictment said. Police seized over 1,000 rounds of ammunition from Brown at the time of his arrest.

Keltner, who had almost 13 years of service with the McHenry County Sheriff’s Office, left behind his wife and two young children.

Brown’s jury trial is in its second week at the Illinois Northern District Court Rockford Courthouse.