(CBS/AP) KNOXVILLE, Tenn. - A man wanted for questioning in thewas taken into custody in Sevier County, Tenn., authorities say.
Brett Knight was apprehended at a house by U.S. marshals around 8:30 a.m. Wednesday, ABC affiliate WATE reports. Officials reportedly recovered two handguns at the scene.
Knight will go through an extradition process on a warrant out of New York. No charges are expected to be filed in Tennessee.
According to media reports, Knight, a former American Express executive, is an estranged friend of Reisner.
CBS New York previously reported Reisner's domestic partner had filed a harassment complaint against Knight, who once lived in a rented-out basement apartment in their home.
The 50-year-old Reisner was killed Sept. 24 when a gunman fired several shots through a window at his home in East Setauket, N.Y., striking Reisner in the chest once and grazing his partner in the arm.
During the initial investigation, authorities said the victims appeared to have been targeted.
"...The shooter clearly stood in the yard and fired through one of the windows from the yard," Suffolk County police detective Lt. Jack Fitzpatrick said.
Neighbors told CBS New York Reisner was a big figure in the Long Island equestrian community and has participated at the Hampton Classic Horse Show for decades.