A dead body was found in the New Jersey home of Giants cornerback Janoris Jenkins on Tuesday — and police have reportedly launched a homicide investigation.

The corpse was discovered in the basement by a worker, who was at the Fair Lawn residence while Jenkins was in Florida, ESPN reported.

The identity of the victim was not immediately released, but neighbors told The Post that the 29-year-old football star would often let family members and friends stay at the residence when he wasn’t there.

“They are really friendly,” said neighbor Danielle Barnes, 31. “When it’s not football season they go to Florida.”

The Bergen County Prosecutor’s Office Major Crimes Unit and Fair Lawn Police Department said they were investigating the death on Tuesday. Sources told ESPN that it was being treated as a homicide.

Neighbors told The Post that Jenkins lived with his girlfriend and brother, though it’s unclear if they were at his luxury, six-bedroom home when the body was discovered.

“The deceased is not the owner of the residence, but the identity of the male decedent cannot be released until next of kin have been notified,” Bergen County prosecutor Dennis Calo said in a statement.

Jenkins has been in the Sunshine State since the end of Giants minicamp two weeks ago, according to ESPN.

“His girlfriend just had a baby,” Barnes said.

The Pro Bowler was reportedly notified about the death on Tuesday morning. The Giants said in a statement that they were also aware and “monitoring the situation.”

Additional reporting by Phil Mushnick and Paul Schwartz