The family of the former Denver Broncos running back said he died after a battle with cancer. He was older than 30.
Wolfe and Franklin said that Hillman had been moved into a hospice care facility.
According to Wolfe, Hillman had lung cancer and had to be hospitalized.
View this post on InstagramA post shared by Ronnie Hillman (@flashlife23)
One of the youngest players selected in recent drafts was a third-round pick by the Broncos. He was selected by the Broncos at the age of 20 and didn't turn 21 until September of his first season.
Brock Osweiler was the other 20-year-old in the draft class.
He finished his two seasons at San Diego State with back-to-back 1,500-yard rushing seasons and 17 and 19 rushing touchdown. He is in the top five on the school's all-time rushing list.
The team's first draft class was formed after the signing of Manning. Two years after the Broncos set the league's single-season scoring record with 606 points, he rushed for 218 yards in limited duty, and the team went on to win the Super Bowl.
He had a career-best 24 catches that year.
He played in five games for the Vikings and three for the Bolts in 2016 and did not play in a regular season game.