Christopher George, 43, of Longmont was shot by a Boulder county deputy on Dec. 29, 2013, the Longmont Times-Call reported.
Police said George's mother had called police because her son had not left his room for several days. When deputies entered to speak with George, he pulled out a gun.
Deputy Brandon Bussard fired multiple rounds at George, who was airlifted and died at a Denver hospital.
Francisco Gutierrez, 39, and Alexander Tower, 37, were found in Tower's home in Denver on Dec. 26, 2013, Fox31 reported.
Police responded to reports of a burglary and discovered the bodies.
The Denver Post cited neighbors, who said Towers was growing and selling marijuana in the residence.
Police posted a reward of $2000 for tips from the public.
Damon Weyrough, 35, was shot and killed outside of Rack'em Billiards and Sports Bar in Aurora on Christmas Eve, Dec. 24, 2013, Westword reported.
While nobody has been apprehended for the crime, Weyrough's family has posted a reward of $5,000 for tips leading to an arrest. 9News showed security camera footage on June 13, 2014, that suggested Weyrough had encountered a group of people in the dark parking lot of the bar when he was shot.
Kiana O'Neil, 14, died in Colorado Springs after entering her own house in the morning of on Dec. 23, 2013, The Gazette reported.
The alleged shooter is the girl's stepfather, Daniel Meade, who mistook her for an intruder. The Gazette reported that Meade was a soldier stationed at Fort Carson.
The Gazette reported on June 19, 2014, that the case had been brought before a Grand Jury and that no charges would be filed against Meade.
Lawrence Sanchez, 49, was killed after a standoff with deputies of the Mesa County Sheriff's Office on Dec. 14, The Daily Sentinel reported.
Sanchez had violated his parole after leaving a halfway house in Pueblo. He was reportedly hiding behind a tree in a field when officers tried to arrest him. Sanchez was armed with a rifle.
The Sentinel reported further that Sanchez had several convictions and had been paroled from the state penitentiary system a total of six times.
Claire Davis, 17, died on Sat., Dec. 21, 2013 from a gunshot wound she sustained one week earlier.
Davis is believed to have been shot at point-blank range with a shotgun by fellow student Karl Pierson, and was in a coma for most of the last week, according to the Denver Post.
Karl Pierson, 18, entered Arapahoe High School in Centennial, Colo., on Friday, December 13 in search of a specific teacher, then killed himself, but not before shooting and injuring Davis.
Police found the shooter's body in a classroom.
According to Arapahoe Sheriff Grayson Robinson, the student entered the high school openly brandishing a shotgun, and asked other students in the area for the location of the teacher he was looking for - Tracy Murphy, the school's head librarian and a coach for speech and debate.
"Word got around immediately," Robinson said.
Upon hearing this information, the teacher left the building immediately, which Robinson stated was a good "tactical move" in order to draw the shooter away from the school and the student body.
The Sheriff stated that the school was evacuated deliberately and methodically with the Operation Mountain Guardian protocols that officers across the state of Colorado have been trained in.
"Those protocols have had to be used far, far too many times in Colorado and across the country," Robinson said.
The Arapahoe Sheriff's office stated that the area will be shut down until at least 10 p.m. on Friday evening and for local traffic to plan alternate routes.
An unidentified man was found dead at the Denver West Inn on Dec. 10.
Lakewood police apprehended Cody Sewick, 21, and charged him with first-degree murder in connection with the incident, The Denver Post reported.
Westword reported that police believes both men were acquaintances.
Sewick is scheduled to appear in court Dec. 12. 2014, Jefferson county inmate records show.
Eddie White, 67, and his wife Betty, 81, were found dead due to gunshot wounds on Dec. 8, 2013, when relatives came to check on them, the Montrose Daily Press reported.
Authorities said earlier that day Eddie White shot his wife and then himself with a rifle. Betty White's failing health was the supposed reason for the murder-suicide.
Steven Jones, 44, was shot and killed on East Colfax Avenue in the early morning hours of Dec. 2, 2013, 7News reported.
The Denver county coroner ruled his death a homicide and said Jones died as the result of multiple gunshot wounds.
Penelope Cunningham, 60, was allegedly murdered by her daughter, 28-year-old Traci Cunningham, during a Thanksgiving trip, the Vail Daily reported.
The two women were driving through a remote part of Eagle county, when an argument occurred. Traci told prosecutors Penelope got out of the truck and walked down the road. Authorities suspect Traci shot her in the back with a gun she said her mother kept in the car.
Penelope worked as an elementary school teacher at Maxwell Elementary School in Denver's Montbello district, Westword reported. She adopted her daughter when Traci was 14 years old.
Traci fled the scene but was apprehended several days later when police tracked her cell phone. She is being held in Eagle County jail on a $1 million bond, according to the Vail Daily.
Traci appeared in court Dec. 2, 2013, the Vail Daily reported. On Dec. 10, 2013, she was charged with murder, according to the 5th Circuit District Attorney's office.