A man has been formally charged in the shooting death of a 15-year-old who may have been trying to steal marijuana plants from a Denver backyard.

The victim’s friend, a 14-year-old, was also shot and is possibly paralyzed.

Keith Hammock, 48, is charged with two counts of first-degree murder, four counts of attempted murder, one count of manufacturing marijuana and one count of cultivation of marijuana.

Prosecutors say in the early morning hours of Oct. 9, Hammock fired at the two teens after they jumped over his fence.

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Authorities believe Hammock also shot a teen in September 2015 under similar circumstances.

9NEWS legal analyst Scott Robinson says it will be difficult for Hammock to use the “Make My Day” law in this case. He says it only applies inside of a home if the person intends to commit a prime and poses a risk of violence to someone inside.

"The law is very clear. You can't use deadly force in defense of property, ever," he said.

The boy who has shot and killed has been identified as Keylin Mosley. His picture and candles were placed in the alley near the backyard where he died.

Hammock is being held without bond at the Denver Detention Center. His next court appearance has not yet been set.