https://cdnph.upi.com/ph/st/th/3261786451906/2026/upi/39c844828202889b6b24363b1b3acaac/v1.5/Damon-Wayans-to-guest-star-on-David-Alan-Griers-St-Denis.jpg" /> NBC has announced that Damon Wayans has signed on to guest star on his former collaborator David Alan Grier's hospital comedy, "St. Denis Medical."