Can a Death Knight summon a pet/minion?

Q: Can a Death Knight summon a pet/minion?
A: Yes, but unless you put a point in master of ghouls (unholy talent) it will not be controllable and only available for a couple of minutes with a 5 minute cooldown. After putting a point in master of ghouls the pet is controllable and permanent unless it dies.
Credit to Andyishere