A New Jersey doctor accused of having his wife killed to protect an illegal prescription drug ring he was running with an outlaw biker gang has been moved to a different jail nearly 100 miles away due to an alleged plot by a co-defendant to kill him.

James Kauffman, 68, of Linwood, New Jersey, is charged with numerous offenses, including murder, racketeering and weapons offenses.

Kauffman and co-defendant Ferdinand Augello, 61, of Petersburg, New Jersey, are charged in the death of Kauffman's 47-year-old wife, April, a radio talk show host who was fatally shot in her home in May 2012.

The charges, including those relating to April Kauffman's shooting as well as the alleged plot to kill James Kauffman, were announced Tuesday after more than five years of investigation.

On Thursday, following brief initial court appearances via video links, prosecutors said Kauffman has been moved from the Atlantic County Jail in Mays Landing to the Hudson County Jail in Kearney, nearly 100 miles away, for his protection.

"We don't think it would be prudent for those two to be lodged together," Atlantic County Prosecutor Damon Tyner said.

The prosecutor said Augello discussed a plan to have Kauffman killed before he could come to trial. Scott Sherwood, a public defender representing Augello, declined to comment Thursday.