Suddenly stopped napping

My 3 year old was a pretty good napper, he would consistently nap once a day for around 2 hours on average. He has suddenly stopped napping all together all of a sudden. I thought if he was going to drop his nap he would gradually cut down on his nap time to at least 30 minutes to an hour if he was actually ready to drop it, is this normal? I can tell he gets tired around his normal nap time and needs a nap but he just refuses to nap now and it's driving me crazy. He's uncontrollable when he's over tired, I want to have good days again but it feels impossible when he's not napping anymore even though he clearly needs it.