Mrs. Herrera claimed that on July 1, 2012 her husband was suicidal and that he held her hand and forced her to shoot him in the head.
In court documents detectives said the way she claimed the gun was fired and the position they were in just did not match up with her husband's injuries.
In addition, investigators said a friend of Mrs. Herrera's came forward saying Amy told them she needed to "tell you the truth about what happened."
The friend went on to say Herrera said, "I shot him" when the friend said they understood that Marc ‘made' her shoot him Herrera responded by saying, "no, I killed him."
Neighbors told News 13 the couple seemed like an average husband and wife saying they were both polite and mostly kept to themselves.
"Never heard them yelling never any noise ya know around the house or the backyard," Monique Kourdae.
Herrera's death was originally thought to be a suicide but in August the office of the medical examiner ruled it a homicide and APD started investigating Amy.
The Major's family told News 13 in an interview last month , they did not believe he would kill himself, they also said they did not know Amy that well because the two had not been married long.
Neighbors said they were shocked to hear she was arrested for Marc's death.
"I would never, never in my wildest dreams expect her to do that type of thing, she just didn't seem to be of that nature," said Kourdae.
Herrera is in the Metro Detention Center on a no bond hold.
Police have not given any details about a possible motive.
Operation Gingerbread arrived in Albuquerque Tuesday for an event to raise funds for the Leukemia and Lymphoma Society.
A Colorado company is recalling 45 tons of meat and poultry products a federal agency says were produced under unsanitary conditions.
KRQE News 13 is hosting a phone bank for Toys for Tots! To help and make a donation please call 505-768-2299 between 4 and 6 p.m. Tuesday.
Santa Claus made a special trip to Presbyterian Hospital Tuesday to visit some sick kids, and he made quite an entrance arriving by helicopter.
Meet Meggie, this week's Pet of the Week. If you're interested in Meggie or any other furry four-legged friend, call the Animal Humane Association of New Mexico at visit the Animal Humane website.
Deputies were led on a chase around 4 p.m. Monday after a person called 911 to report their vehicle had been stolen and was being driven recklessly around Albuquerque.