A man wanted for questioning in the fatal shooting last month of a well-known Long Island horseman was arrested Wednesday by federal agents in rural Tennessee.

Brett C. Knight, 45, a former tenant in the Setauket home of victim Ross Reisner, was found by federal marshals, Suffolk County Homicide Squad detectives and officers from the Sevier County Special Operations Response Team at a home in Seymour, a town of about 10,000 near Knoxville, the U.S. Marshals Service said in a statement Wednesday.

Knight, of Manhattan, was sought in connection with Reisner's death and the attempted murder of Reisner's partner, Kevin Murray, wounded in the shooting at their home, the marshals said.

"I'm very relieved, and I'm very sad," said Ian Reisner, the victim's brother.

Knight, held in the Sevier County jail, signed extradition papers to New York, the Sevier County Sheriff's Office said.

The Sept. 24 shooting of Reisner spurred a nationwide search for Knight, who "purchased a motorcycle and was said to be traveling throughout the country," the marshals service said in a news release.

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Two handguns were recovered from the home in Seymour during Knight's arrest, the release said.

Authorities did not say whether either was used in the shooting or if Knight was to be charged in the shooting.

Suffolk police said the investigation is continuing and declined to answer questions.

"We found him in the house," said John Sanchez, a marshals spokesman in eastern Tennessee. "He didn't run or anything like that. Thanks to the special operations response team from Sevier County and with our preparation . . . everything went as planned."

Reisner, considered a fixture in the Island's equestrian community, was in his home on Upper Sheep Pasture Road with his domestic partner when police said several shots were fired from outside the residence about 8:45 p.m. Sept. 24. One bullet struck Reisner in the chest, killing him, police said.

Murray was grazed in the arm but declined medical attention, Det. Lt. Jack Fitzpatrick, commander of the Suffolk police Homicide Squad, said in the aftermath.

Murray could not be reached Wednesday, but court papers show he said he had been harassed by Knight, who was then renting a basement apartment in Reisner's home.

Knight was charged with second-degree harassment, a misdemeanor but had failed to appear before an arraignment judge in First District Court in Central Islip on Sept. 4 -- that failure to appear prompted the arrest warrant.

Sanchez declined to say when authorities became aware of Knight's whereabouts and referred questions to Suffolk investigators.

"We had enough time to plan," Sanchez said. "This was Suffolk County's homicide squad and the marshals service working together and just putting all the pieces of information together on Mr. Knight."