Jenkins acknowledged with "regret and sadness" the passing of Rene, whom the Giants cornerback called a "good friend" and noted the two were working on producing music together.
"It truly hurts my heart to know he has passed away," Jenkins said in a post on Instagram. "At the time of the incident, I was in Florida preparing to finish off my promotional tour.
"As this is an ongoing incident, I cannot answer any questions related to the investigation. I am praying for Roosevelt and his family."
Police and the Bergen County (N.J.) Prosecutor's Office are investigating the death as a possible strangulation/suffocation incident, NFL Network's Mike Garafolo previously reported.