NEWARK — An Essex County Sheriff's officer has been charged with sexually assaulting a Newark woman in her home over the weekend, authorities announced today.

Dinis Oliveira, 31, turned himself in today on charges of second-degree sexual assault, second-degree sexual misconduct and fourth-degree criminal coercion, Acting Essex County Prosecutor Carolyn A. Murray said in a statement.

The arrest stemmed from a complaint by a 31-year-old Newark woman who contacted authorities on Saturday, alleging a man claiming to be a law enforcement officer had assaulted her in her home.

Murray did not disclose details of the alleged incident, but said the victim "complied with (Oliveira's) demands" before reporting it to Newark police.

An investigation that included the prosecutor's office was launched, and Oliveira was quickly identified as a suspect. Warrants for his arrest were signed today, and a judge later ordered him held on $200,000 bond with no 10 percent option.

Sheriff Armando Fontoura said Oliveira had been suspended without pay following his arrest.

He had been assigned to work at Veterans Courthouse in Newark, and had worked as a volunteer deputy sheriff's officer for approximately one year prior to joining the department in June 2014. He added that the alleged assault occurred during the evening, when Oliveira was off duty and out of uniform.

"We do recruit from the human race and sometimes some of our folks will disappoint us," Fontoura said.

An investigation into the incident remains active.

Dan Ivers may be reached at divers@njadvancemedia.com. Follow him on Twitter at @DanIversNJ. Find NJ.com on Facebook.