Prentice (Army of Ghosts)
From Tardis Wiki, the free Doctor Who reference
"Granddad Prentice" was the father of Jackie Tyler and the grandfather of Rose Tyler. He smoked. He died from a heart attack in 1997, but according to Jackie in 2007, came back as a friendly ghost. This ghost was actually a Cyberman that was passing through the Void to reach Rose and Jackie's universe. (TV: Army of Ghosts)
