Stubblefield served as Penn State's wide receivers coach for three years.
The reason for the closure is currently unclear.
Lee is entering the portal with two years of eligibility remaining.
Miller graduated in 2017 with a bachelor’s degree in finance and went on to work as a project manager at IBM.
Jacobs joins defensive end Adisa Isaac as the latest impact defender to announce their return for next season.
Penn State is one of three Big Ten teams ranked in the poll, joining Michigan (No. 3) and Ohio State (No. 4).