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Lt. John Formisano, a 24-year department veteran, was arrested in Livingston about a half hour after the shooting, according to authorities in Morris and Essex counties.
Formisano recently was suspended for an unknown cause, News 12 New Jersey reported.
Officers responded to the Mirror Place home in the Oak Ridge section of the township on reports of shots fired, the Morris County Prosecutor's Office said.
Formisano apparently opened fire, killing his ex-wife and critically wounding her boyfriend, reports say.
The prosecutor's office confirmed the female was dead and a male was in critical condition.
Facebook photos show Formisano and his estranged wife had two young children at home.
Additional information was not immediately available.
“The Newark Public Safety Department is deeply saddened by the family tragedy involving Newark Police Lt. John Formisano. Our foremost concern, of course, is for the couple’s two children who have lost their mother and for the family of the victim," Newark's public safety director, Anthony Ambrose, said in a statement.
"Lt. Formisano’s colleagues in our police division were shocked by the news of the shooting and we recognize it this is a tragedy beyond comprehension for all involved.”
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