The Atlantic County Prosecutor's Office said that their agents, along with the FBI and local police, executed search warrants on the home and business of Dr. James Kauffman.
While executing the warrant, authorities say Kauffman displayed a handgun at his Egg Harbor Township office.
A hostage negotiator was brought in, and Kauffman eventually surrendered to authorities.
He is now under arrest and is being monitored by the Psychiatric Intervention Program.
He will be charged with unlawful possession of a weapon, possession of a weapon for an unlawful purpose, possession of hollow point bullets and obstruction of the administration of law. There was no word on any charges related to the murder case.
The prosecutor's office said "our investigation will continue based upon the information gleaned from today's search and other leads."
On May 10, 2012, an employee of Kauffman's discovered her shot to death in the home she shared with her husband.
Police have previously said her husband told them April was alive when he left that morning. Days after the murder, authorities said it was not a random act of violence and hoped to make an arrest soon. Over the years, little information about the case was released. No one has ever been charged in the murder.
However, in April, Prosecutor Damon Tyner's office filed a motion requesting the DNA of James Kauffman. The judge's decision on that request was sealed.
James Kauffman's attorney maintained his client's innocence in an interview with Action News in May.
April Kauffman's daughter, Kimberly Pack, is in a legal battle with James Kauffman, her stepfather, sparked by his attempts to claim April Kauffman's two life insurance policies.
The prosecutor's office would not provide a letter to April's life insurer saying James wasn't considered a suspect.