CENTRAL ISLIP - The man accused of murdering a well-known Long Island equestrian has pleaded not guilty and was ordered to be held without bail this morning.

Ross Reisner, 50, was shot dead by a bullet that came through the window of his East Setauket home last month. Police say Brett Knight, 45, is the man who was behind Reisner's murder.

Knight was arrested in a Tennessee home and brought back to New York yesterday. He is now facing second-degree murder charges.

After the Sept. 24 shooting, neighbors told News 12 they heard the gunfire that night and the screams for help.

Reisner's partner, Kevin Murray, was also injured that night after he was grazed by a bullet. Neighbors say Knight used to rent from the couple a number of years ago.

According to published reports, Murray filed a harassment complaint against Knight just last month.

He claimed that his former tenant harassed him and even sent him an anonymous package.

If convicted, Knight faces 25 years to life in prison.