Is it normal to joke about killing your girlfriend?

My boyfriend jokes about killing me sometimes, by choking me and jokes about beating me up. The latter is fine as I consider it horse play and he has that sort of a personality but the homicide jokes really make me uncomfortable. I like people who are romantic, sweet and kind to their partners, he knows this. Am I overreacting? Is this a normal thing for guys to think/say?

Is it normal to joke about killing your girlfriend?
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