Could Double Jeopardy Happen?

The doctrine of double jeopardy does exist, and it basically says that you cannot be tried for the same crime twice. But if the two supposed murders didn't take place at the same time and place, they're not the same crime, simple as that.

Is double jeopardy ever allowed?

The Double Jeopardy Clause in the Fifth Amendment to the US Constitution prohibits anyone from being prosecuted twice for substantially the same crime. The relevant part of the Fifth Amendment states, "No person shall . . . be subject for the same offense to be twice put in jeopardy of life or limb . . . . "

Can double jeopardy be overturned with new evidence?

The obvious application of double jeopardy is when law enforcement finds new evidence of the defendant's guilt after the jury has already acquitted them. The prosecution cannot charge them again, even if the evidence shows that they probably are guilty.