Cardiologist Charged in Murder-for-Hire Plot Against Rival Doctor Had Massive Weapons Cache Hidden

Dr. Anthony Moschetto is accused of attempting to hire a hit man to kill his former partner, fellow cardiologist Martin Handler.

It's a case shocking the nation of the prominent cardiologist arrested in a plot to slay his competitor.

Dr. Anthony Moschetto is accused of attempting to hire a hitman to kill his former partner, fellow cardiologist Martin Handler, who just last year appeared on Fox and Friends to talk about providing medical treatment to military veterans.

Dr. Moschetto's alleged motive? To steal Dr. Handler's patients.

Read: Aaron Hernandez Jurors Break Their Silence on Guilty Verdict.

Until last November, the two doctors were partners in a medical practice in Long Island, New York. But after a falling out, Dr. Moschetto left the practice and opened his own office nearby.

The plot allegedly began when Moschetto hired two men to burn down his rival's office. Surveillance photos show the fire being set. But the building's sprinkler system doused the flames. That's when the district attorney says Moschetto decided to eliminate his rival altogether.

"He was willing to pay $5,000 to have him beaten and in the hospital for a few months and then he said he would pay $20,000 to have him killed," said District Attorney Anne Donnelly at a press conference.

In an undercover police surveillance photo, Moschetto is seen allegedly paying a hitman to beat up Dr. Handler. The hitman was actually an undercover cop.

Moschetto lives in an amazing $3 million mansion on Long Island's so-called Gold Coast. When cops searched the place, they found things that shocked them including a secret room behind a motorized bookshelf that housed a hundred weapons and knives that seemed to come straight out of medieval times. Also, semi-automatic guns and other weaponry. 

Watch: Miss USA Runner Up Audrey Bolte at Center of Love Triagle Murder.

Dr. Moschetto pled not guilty to all charges and his attorney Randy Zelin told reporters, "I have no reason to believe that there was anything wrong with collecting what you saw."

We found that many of his patients are standing by him. Joan Curatola has been treated by Dr. Moschetto for almost a decade. She told INSIDE EDITION, "I thought, no, this is not true. It can't be. It's shocking. Devastating."

A  doctor who took an oath to save lives, now accused of trying to end one.