A Nicaraguan diplomatic official was found dead in a Bronx apartment with his throat slit, New York City police say.

Police said the 34-year-old Cesar Mercado, was being picked up by his driver for the United Nations General Assembly's annual meeting when he was found dead at 10:35 a.m. Thursday.

Mercado was a consulate officer who'd worked in New York for about eight years.

Mercado's body was found in a sixth-floor apartment believed to be his residence.  The door was ajar and a knife was recovered at the scene.

Mercado came to the U.S. in 2001 to work as an assistant in the office of Nicaragua's ambassador to the United Nations, a friend said. He was single and his family was in Nicaragua.

He eventually became consul general, working with passports and immigration visas. The assistant to the ambassador said the mission couldn't immediately release any information.

Mercado's friend Amparo Amador said he was like a son to her. Recently, she'd urged him to go to the doctor because he looked thin, and he had been diagnosed with diabetes.

The two went to the wedding of another friend in Brooklyn just six days ago, where he danced and had fun.

"He had no enemies. He was loved by everyone who knew him," she said in Spanish. "When I first heard of his death, I thought he must've died from natural causes because there would be no way he could be killed."

She said he lived the life of a young, single guy, but he wasn't wild.

"He was the perfect guy. The best person, just wonderful," she said. "I feel as if one of my children has died."

There was no immediate word on a motive and no suspects had been identified.

Nicaraguan Vice President Jaime Morales said U.S. Ambassador Robert Callahan assured him that the FBI would do everything possible to investigate.

"The investigation is ongoing," a police source told FoxNews.com.

Leaders from 192 nations were in town for the General Assembly, including Nicaraguan President Daniel Ortega, who is a staunch critic of the United States, and a defender of North Korea and Iran. 

The Associated Press contributed to this report.